High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and LFV Decays in SU(‎5)

Parida, M. K.; Satpathy, Rajesh

doi:https://doi.org/10.1155/2019/3572862

Advances in High Energy Physics

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Neutrino Physics in the Frontiers of Intensities and Very High Sensitivities 2018

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Research Article | Open Access

Volume 2019 | Article ID 3572862 | https://doi.org/10.1155/2019/3572862

High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and LFV Decays in SU(‎5)

M. K. Parida¹and Rajesh Satpathy¹

Guest Editor: Hiroyasu Ejiri

Received02 Sept 2018

Accepted17 Dec 2018

Published03 Feb 2019

Abstract

Very recently novel implementation of type-II seesaw mechanism for neutrino mass has been proposed in grand unified theory with a number of desirable new physical phenomena beyond the standard model. Introducing heavy right-handed neutrinos and extra fermion singlets, in this work we show how the type-I seesaw cancellation mechanism works in this framework. Besides predicting verifiable LFV decays, we further show that the model predicts dominant double beta decay with normal hierarchy or inverted hierarchy of active light neutrino masses in concordance with cosmological bound. In addition a novel right-handed neutrino mass generation mechanism, independent of type-II seesaw predicted mass hierarchy, is suggested in this work.

1. Introduction

Renormalizable standard model (SM) predicts neutrinos to be massless whereas oscillation experiments prove them to be massive [1–5]. All the generational mixings have been found to be much larger than the corresponding quark mixings. Theoretically [6–13] neutrino masses are predicted through various seesaw mechanisms [14–43]. In a minimal left-right symmetric [44–47] grand unified theory (GUT) like [48, 49] where parity (P) violation in weak interaction is explained along with fermion masses [50–55], a number of these seesaw mechanisms can be naturally embedded while unifying the three forces of the SM [56–72]. More recently precision gauge coupling unification has been successfully implemented in direct symmetry breaking of which may have high potential for new physics [73].

The model that predicts the most popular canonical seesaw as well as the type-II seesaw has also the ability to explain baryon asymmetry of the universe via leptogenesis through heavy RH neutrino [74] or Higgs triplet decays [75–77]. But because of underlying quark lepton symmetry [44], the type-I seesaw scale as well as RH masses are so large that the model predicts negligible lepton flavor violating (LFV) decays like , , , and . Similarly direct mediation of large mass of scalar triplet required for type-II seesaw gives negligible contribution to lepton number violating (LNV) and lepton flavor violating (LFV) decays. Ever since the proposal of left-right symmetry, extensive investigations continue in search of experimentally observable double beta decay [78–82] in the channel [83, 84]. Adding new dimension to such lepton number violating (LNV) process, the like-sign dilepton production has been suggested as a possible means of detection of -boson at accelerator energies [85], particularly the LHC [43]. However, no such signals of TeV scale have been detected so far. Even if mass and seesaw scales are large and inaccessible for direct verification, neutrinoless double beta decay () in the channel [20, 86–91] is predicted close to observable limit with yrs provided light neutrino masses predicted by such high scale seesaw mechanisms are quasidegenerate (QD) with each mass eV [78] and their sum eV. But as noted by the recent Planck data such QD type masses violate the cosmological bound [92].The fact that such QD type masses violate the cosmological bound may be unravelling another basic fundamental reason why detection of double beta decay continues to elude experimental observation for several decades. On the other hand, if neutrinos have smaller NH or IH type masses, there is no hope for detection of these LNV events in near future with RH extended SM. In other words, predicting observable double beta decay in the channel with left-handed helicities of both the beta particles has been a formidable problem confronting theoretical and experimental physicists. However, it has been shown that in case of dynamical seesaw mechanism generating Dirac neutrinos the seesaw scale is accessible for direct experimental verification [93].

The path breaking discovery of inverse seesaw [25–31] with one extra singlet fermion per generation not only opened up the neutrino mass generation mechanism for direct experimental tests, but also lifted up lepton flavor violating (LFV) decays [94] from the abysmal depth of experimental inaccessibility of negligible branching ratios () to the illuminating salvation of profound observability (Br.) [95–100] which has been discussed extensively [99, 101–118]. Despite inverse seesaw, observable double beta decay in the channel and the non-QD type neutrino masses remained mutually exclusive until both the RH neutrinos and singlet fermions () were brought into the arena of LFV and LNV conundrum through the much needed extension of the Higgs sector. The King-Kang [119] mechanism cancelled out the ruling supremacy of canonical seesaw which was profoundly exploited in models with the introduction of both the Higgs representations and [13, 84, 120–125] with successful prediction of observable double beta decay in the channel [20, 86]. Very interestingly, even though high scale type-II seesaw can govern light neutrino masses of any hierarchy, possibility of observable LFV and double beta decay prediction in the channel irrespective of light neutrino mass hierarchies has been realized at least theoretically [13, 125].

The purpose of this work is to point out that there are new interesting physics realizations with suitable extension of a non-SUSY GUT model proposed recently [126] where type-II seesaw, precision coupling unification, verifiable proton decay, scalar dark matter, and vacuum stability have been already predicted. However with naturally large type-II seesaw scale GeV, observable double beta decay accessible to ongoing experiments [78–82] is possible in this model too with QD type neutrinos only of common mass with eV like many other high scale seesaw models as noted above. In this work we make additional prediction that dominant double beta decay in the channel can be realized with NH or IH type hierarchy consistent with much lighter neutrino masses eV. Thus, this realization is consistent with cosmological bound of (1). Although such possibilities were realized earlier in with TeV scale or bosons as noted above, in without the presence of left-right symmetry and associated gauge bosons, we have shown here for the first time that the dominant double beta decay is mediated by a sterile neutrino (Majorana fermion singlet) of GeV mass of first generation. The model further predicts LFV decay branching ratios only 4–5 orders smaller than the current experimental limits. An additional interesting part of the present work is the first suggestion of a new mechanism for heavy RH mass generation that permits these masses to have hierarchies independent of conventional type-II seesaw prediction. Thus highlights of the present model are as follows:(i)first implementation of type-I seesaw cancellation mechanism leading to the dominance of type-II seesaw in ;(ii)prediction of verifiable LFV decays only orders smaller than the current experimental limits;(iii)prediction of dominant double beta decay in the channel close to the current experimental limits for light neutrino masses of NH or IH type in concordance with cosmological bound;(iv)suggestion of a new right-handed neutrino mass generation mechanism independent of type-II predicted mass hierarchy;(v)precision gauge coupling unification with verifiable proton decay which is the same as discussed in [126].

This paper is organised in the following manner. In Section 2 we briefly review the model along with gauge coupling unification and predictions of the intermediate scales. In Section 3 we discuss how type-I seesaw formula for active neutrino masses cancels out giving rise to dominance of type-II seesaw and prediction of another type-I seesaw formula for sterile neutrino masses. Fit to neutrino oscillation data is discussed in Section 4. In Section 5 we suggest a new mechanism of RH mass generation. Prediction on LFV decay branching ratios is discussed in Section 6. Lifetime prediction for double beta decay is presented in Section 7. In Section 8 we discuss the results of this work and state our conclusion. Block diagonalization procedure is explained in more detail in Appendix A.

2. A Non-Supersymmetric SU(‎5) Model

2.1. Extension of SU(‎5)

As noted in [127], inclusion of the scalar with mass in the extended non-SUSY achieves precision gauge coupling unification. Then it has been shown in [126] that type-II seesaw ansatz for neutrino mass is realized by inserting the entire Higgs multiplet containing the LH Higgs triplet at the same mass scale .

The scalar singlet has played two crucial interesting roles of stabilising the SM scalar potential as well as serving as WIMP DM candidate. The introduction of at any scale GeV in this model maintains precision coupling unification. In the present model we extend the model further by the inclusion of the following fermions and an additional scalar :(i)three right-handed neutrino singlets , one for each generation, with masses to be fixed by this model phenomenology;(ii)three left-handed Majorana fermion singlets , one for each generation, similar to those introduced in case of inverse seesaw mechanism [25–31];(iii)a Higgs scalar singlet to generate mixings through its VEV.

Being singlets under the SM gauge group, they do not affect precision gauge coupling unification of [126].

2.2. Coupling Unification, GUT Scale, and Proton Lifetime

As already discussed [126, 127] using renormalization group equations for gauge couplings and the set of Higgs scalars of (2), precision unification has been achieved with the PDG values of input parameters [128–130] on , resulting in the following mass scales and the GUT fine-structure constant :

Using threshold effects due to superheavy Higgs scalars [131–138], proton lifetime prediction for turns out to be in the experimentally accessible range [139]:

Extensive investigations with number of GUT extensions have been carried out with proton lifetime predictions consistent with experimental limits [140–149]. But implementation of type-II seesaw dominance due to type-I seesaw cancellation resulting in dominant LFV and LNV decays as discussed below is new especially in the context of non-SUSY .

3. Cancellation of Type-I and Dominance of Type-II Seesaw

Due to introduction of heavy RHs in the present model which were absent in [126], it may be natural to presume a priori that besides type-II seesaw, type-I seesaw may also contribute substantially to light neutrino masses and mixings. But it has been noted that there is a natural mechanism to cancel out type-I seesaw contribution while maintaining dominance of inverse seesaw [84, 119, 120, 122–124] or type-II seesaw or even linear seesaw [13, 125] as the case may be. Briefly we discuss below how this cancellation mechanism operates in the present extended model resulting in type-II seesaw dominance even in the presence of heavy RHs.

The SM invariant Yukawa Lagrangian of the model is Using the VEVs of the Higgs fields and denoting , , a neutral fermion mass matrix has been obtained which, upon block diagonalization, yields mass matrices for each of the light neutrino (), the right-handed neutrino (), and the sterile neutrino () [120, 124, 125]. The block diagonalization of neutral fermion mass matrix was presented in useful format in [32] but without cancellation of type-I seesaw. Later on, this diagonalization procedure has been effectively utilized to study the type-I seesaw cancellation mechanism in models [13, 120, 124, 125].

In this model the left-handed triplet and RH neutrinos being much heavier than the other mass scales with are at first integrated out from the Lagrangian leading towhich, in the basis, gives the mass matrixwhile the heavy RH neutrino mass matrix is the other part of the full neutrino mass matrix. This mass matrix which results from the first step of block diagonalization procedure as discussed above and in the Appendix isDefining

the transformation matrix has been derived as shown in (10) [120, 125] After the second step of block diagonalization, the type-I seesaw contribution cancels out and gives in the basiswhere has been derived in (12) [120, 125]. We have used the bare mass of and VEV of to be vanishing, i.e., , , to get the form suitable for this model building.

In (11) the three matrices are the first of which is the well-known type-II seesaw formula and the second is the emergence of the corresponding type-I seesaw formula for the singlet fermion mass. The third of the above equations represents the heavy RH mass matrix.

In the third step, , , and are further diagonalized by the respective unitary matrices to give their corresponding eigenvalues:The complete mixing matrix [32, 120] diagonalizing the above neutrino mass matrix occurring in (8) and in (A.1) of the Appendix turns out to beas shown in the Appendix. In (18), , , and .

The mass of the singlet fermion is acquired through a type-I seesaw mechanism:where is the mixing mass term in the Yukawa Lagrangian (6).

4. Type-II Seesaw Fit to Oscillation Data

4.1. Neutrino Mass Matrix from Oscillation Data

Using diagonalization of neutrino mass matrix by the PMNS matrix where denote the mass eigen values. For neutrino mixings we use the abbreviated cyclic notations , , where are cyclic permutations of generational numbers . Following the standard parametrisation we denote the PMNS matrix [128–130]where is the Dirac CP phase and are Majorana phases.

Here we present numerical analyses within limit of the neutrino oscillation data in the type-II seesaw framework [126]. As we do not have any experimental information about Majorana phases, they are determined by means of random sampling; i.e., from the set of randomly generated values, each confined within the maximum allowed limit of , only one set of values for is chosen. Very recent analysis of the oscillation data has determined the and limits of Dirac CP phase [1]. The best fit values of in the normally ordered (NO) and invertedly ordered (IO) cases are near and , respectively, which we utilize for the sake of simplicity. A phenomenological model analysis has yielded [150].

Global fit to the oscillation data [1] is summarized below including respective parameter uncertainties at level:We denote the cosmologically constrained parameter, the sum of the three active neutrino masses, as For normally hierarchical (NH), inverted hierarchical (IH), and quasidegenerate (QD) patterns, the experimental values of mass squared differences have been fitted by the following values of light neutrino masses and the respective values of the cosmological parameter .Using oscillation data and best fit values of the mixings, we have also determined the PMNS mixing matrix numerically:

4.2. Determination of Majorana Yukawa Coupling Matrix

Now inverting the relation where is the diagonalized neutrino mass matrix, we determine for three different cases and further determine the corresponding values of the matrix using where we use the predicted value of eV.

NH

IH

QD

Randomly chosen Majorana phases [126] , , and the central value of the Dirac phase have been used in this analysis. Using the well-known definition of the Jarlskog-Greenberg [151, 152] invariant, and keeping at its best fit values, we have estimated the predicted allowed ranges of the CP-violating parameter in both cases: where the variables have been permitted to acquire values within their respective ranges of the oscillation data. Besides these there are nonunitarity contributions which have been discussed extensively in the literature.

4.3. Scaling Transformation of Solutions

In general there could be type-II seesaw models characterizing different seesaw scales and induced VEVs matching the given set of neutrino oscillation data represented by the same neutrino mass matrix. For two such models, Then the matrix in one case is determined up to good approximation in terms of the other from the knowledge of the two seesaw scales.At GeV our solutions are the same as in [126]. In view of this scaling relation, we can determine the values of the Majorana Yukawa matrix in the present case from the estimations of [126]. For example, if we choose GeV in the present case compared to GeV in [126], we rescale the solutions of [126] by a factor to derive solutions in the present case. Thus graphical representations of solutions are similar to those of [126] for GeV which we do not repeat here. The values of magnitudes of at any new scale are obtained by rescaling them by the appropriate scaling factor while the phase angles remain the same as in [126].

4.4. Dirac Neutrino Mass Matrix

The Dirac neutrino mass matrix plays crucial role in predicting LFV and LNV decays. In certain models [50, 51, 125] this is usually determined by fitting the charged fermion masses at the GUT scale and equating it with the up-quark mass matrix. The fact that at the GUT scale follows from the underlying quark lepton symmetry [44] of . In itself, however, there is no such symmetry to predict the structure of in terms of quark matrices. Also in this model we do not attempt any charged fermion mass fit at the GUT scale or above it. Since the Dirac neutrino mass matrix is not predicted by the symmetry itself, for the sake of simplicity and to derive maximal effects on LFV and LNV decays, we assume to be equal to the up-quark mass matrix at the GUT scale. Noting that is singlet fermion, in the context of relevant Yukawa interaction Lagrangianthis assumption is equivalent to alignment of the two Yukawa couplings:This alignment is naturally predicted in or SO [73], but in the present case it is assumed.

We realize this matrix using renormalization group equations for fermion masses and gauge couplings and their numerical solutions [153–155] starting from the PDG values [128–130] of fermion masses at the electroweak scale. Following the bottom-up approach and using the down-quark diagonal basis, the quark masses and the CKM mixings are extrapolated from low energies using renormalization group (RG) equations [153–157]. After assuming the approximate equality at the GUT scale where is the up-quark mass matrix, the top-down approach is exploited to run down this mass matrix using RG equations [153]. Then the value of near TeV scale turns out to be

As already noted above, although on the basis of symmetry alone there may not be any reason for the rigorous validity of (35), in what follows we study the implications of this assumed value of to examine maximum possible impact on LFV and LNV decays discussed in Sections 6 and 7. Another reason is that the present assumption on may be justified in direct breaking to the SM which we plan to pursue in a future work.

5. Right-Handed Neutrino Mass in SU(‎5) vs SO(‎10)

5.1. RH Mass in SO(‎10)

The fermions responsible for type-I and type-II seesaw are the LH leptonic doublets and the RH fermionic singlets of three generations. In the left-handed lepton doublet and the right-handed neutrino are in the same spinorial representation . The Higgs representation contains both the left-handed and the right-handed triplets carrying ,where the quantum numbers are under the left-right symmetry group . The common Yukawa coupling in the Yukawa term generates the dilepton-Higgs triplet interactions both in the left-handed and right-handed sectors giving rise to type-I and type-II seesaw mechanisms. The RH neutrino mass is generated through the VEV of the neutral component of the of The type-II seesaw contribution to light neutrino mass iswhere is the corresponding induced VEV of Here is the quartic coupling in the part of the scalar potential Thus with type-II seesaw dominance, the predicted heavy RH neutrino masses in follow the same hierarchical pattern as the active light neutrino masses

5.2. RH Mass in SU(‎5)

Feynman diagram for type-II seesaw mechanism in the present model is shown in Figure 1.

In contrast to where the LH leptonic doublet and the RH are in one and the same representation , in they are in different representationsIn , while the dilepton-Higgs interaction is given bythe RH neutrino mass is generated throughThe fact that is a singlet under forces to be a singlet too. Further this singlet must carry as its VEV generates the heavy Majorana mass In sharp contrast to where the LH triplet and the RH triplet scalars contained in the same representation generate the type-II seesaw and , the situation in is different. Since LH triplet mediating type-II seesaw belongs to Higgs representation and belongs to a completely different representation (which is a singlet ), the two relevant Majorana type couplings in general may not be equal Also this assertion is further strengthened if we do not assume to be a remnant of . Then the RH neutrino mass hierarchy can be decoupled from the type-II seesaw prediction. It is interesting to note that in where is the trilinear coupling in the potential term The VEV of this singlet can explain the dynamical origin of such trilinear coupling through its VEV where is the quartic coupling in the potential termwhere the second line represents the origin. For GUT scale symmetry breaking driving VEV in the natural absence of any intermediate symmetry, it is possible to ensure for Thus the model gives similar explanation for quartic coupling as in direct breaking case of . But the predicted hierarchy of RH masses in may not, in general, follow the same hierarchical pattern as given by shown in (43). This is precisely so because (43) follows from the fact that the same matrix diagonalizes both the LH and the RH neutrino mass matrices which is further rooted in the fact that the same Majorana coupling that generates the type-II seesaw mass term also generates . But because of the general possibility in that , the RHs may acquire a completely different pattern depending upon the value of . Unlike , these masses emerging from are also allowed to be quite different from the type-II seesaw scale.

Even if the value of may be needed to be near , the value of is allowed to be considerably lower by fine-tuning the value of . Our LFV and LNV decay phenomenology as discussed below may need TeV which is realizable using this new technique in . In contrast needs [84, 125, 157] or gauge symmetry and hence new gauge bosons near the TeV scale to generate such RH masses which should be detected at LHC [84, 125]. Thus a new mechanism for RH mass emerges here by noting the coupling which has the potential to generate RH masses over a wide range of values GeV. Then the RH mass predictions in the two GUTs in the presence of type-II seesaw dominance are as follows:

Type-II Seesaw Dominated SO(10)

Type-II Seesaw Dominated SU(5)Here , are the three mass eigen values of light neutrinos. It is to be noted that is absent in the RHS of (56) in the case.

5.3. Realization of Mass Hierarchies

Here we discuss how the stated hierarchy in Section 3for type-II seesaw dominance, is realized through fine tuning. At first noting that the mass squared term for in the scalar potential, , is invariant, can have any mass below the GUT scale subject to proton stability and gauge coupling unification. Since , unlike , does not have Yukawa interactions with SM fermions, the Higgs mediated proton decay is suppressed. We now explain why we have used GeV. In our model it is possible to assign any mass where the mass of is GeV. Because of the presence of at such intermediate mass value, precision gauge coupling unification is achieved which has been discussed separately [126, 127]. Following the standard symmetry breaking SM through the GUT scale VEV of the SM singlet scalar in the adjoint representation , , a invariant scalar potential gives the mass of This leads to . Here . Thus fine-tuning any one of these four parameters can give GeV. The presence of below destabilizes unification but protects it for . This has led to the chosen value of GeV. We have noted in the following section that the value of TeV violates the observed bound on the nonunitarity parameter leading to the lower bound on in the degenerate case Here . Noting the definition we now argue that even for GUT scale mass of and its VEV , it is possible to satisfy (59). For GeV we need a small fine-tuned value of Yukawa coupling which satisfies TeV but does not affect any known fermion mass. This shows the interesting possibility that even without having a low mass nonstandard Higgs , it is possible to realize the extended seesaw with type-II seesaw dominance. However, if we insist on , we need TeV and TeV which is realizable as is a scalar singlet. As we have assumed , this gives at GUT scale on extrapolation [153] Here is the top-quark mass. Thus achieving precision unification and type-II seesaw dominance has already given us whereas fine-tuning the Majorana coupling, , has yielded GeV. Combining these with (59) and (62) gives the hierarchical relation of (57).

6. Lepton Flavor Violations

Using SM extensions there has been extensive investigation of lepton flavor violating phenomena and other processes like including unitarity violations [101–108, 110–116]. In the flavor basis we use the standard charged current Lagrangian

In predicting the LFV branching ratios we have used the relevant formulas of [101] and assumed a simplifying diagonal structure for M,Then (64), in combination with (35), gives the elements of the mixing matrix The mixing matrix, is relatively damped out since . In fact the type-I cancellation condition ensures this damping. Noting that the physical neutrino flavor state is a mixture of , , and , Here and the other two mixings violate unitarity. For large the third term in the RHS of (67) can be dropped leading to the unitarity violation parameter Here There has been extensive discussion on the constraint imposed on this parameter [108, 111]. The largest out of these is . Theoretically In the completely degenerate case of mixing, , we get the following.

The RH neutrinos in the present model being degenerate with masses have much less significant contributions than the singlet fermions. The predicted branching ratios being only few to four orders less than the current experimental limits [95] are verifiable by ongoing searches,For the sake of completeness we present the variation of LFV decay branching ratios as a function of the lightest neutrino mass in Figure 2.

In this approach the LFV decay rate mediated by the boson in the loop depends predominantly upon mixing matrix and the Dirac neutrino mass matrix , although subdominantly upon the RH mass matrix . However in the high scale type-II seesaw ansatz followed here LFV decay rate is independent of light neutrino masses. This behavior of LFV decay rates is clearly exhibited in Figure 2 where the three branching ratios have maintained constancy with the variation of .

7. Dominant Channel Double Beta Decay within Cosmological Bound

7.1. Double Beta Decay Mediation by Sterile Neutrinos

In the absence of bosons and right-handed in , there is no contribution to right-handed double beta production. The gauge coupling unification constraint sets the lower bound on the masses of left-handed doubly charged Higgs bosons to be GeV. As such they have negligible contributions for direct mediations of process with left-handed electrons. Thus the only significant contributions in the channel could be through the mediation of , , and . Feynman diagrams for decay amplitude in the channel due to the exchanges of Majorana fermions , , and are shown in Figure 3. In Figure 4 we also present Feynman diagram for decay amplitude due to the sterile neutrino exchange where its mass insertion has been explicitly indicated. Mass eigen values of different sterile neutrinos for different sets of consistent with constraints on unitarity violating parameters are presented in Table 1. We have used the singlet fermion mass seesaw formula of (15) and GeV. These solutions are displayed in Figure 5.

(a)

(b)

(c)

We use normalizations necessary for different contributions [158–164] due to exchanges of light neutrinos, sterile neutrinos, and the heavy RH neutrinos in the channel. They lead to the inverse half-life [120, 124, 125],Here , , and . In (73) the three effective mass parameters have been defined aswith

The quantity is the i-th eigen value of the fermion mass matrix . The magnitude of neutrino virtuality momentum has been estimated to be in the allowed range MeV MeV [158–164]. The contributions of the RHs, being much heavier than the singlet fermions, have been neglected.

7.2. Singlet Fermion Assisted Enhanced Double Beta Decay Rate

We use neutrino oscillation data to estimate for NH and IH cases with the values of Dirac phase and Majorana phases as discussed above. We further use the values of from Table 1 and Figure 5 and the Dirac neutrino mass matrix from (35) to estimate while treating the RH mass at its assumed degenerate value of . The variation of effective parameter as a function of lightest neutrino mass is shown in Figure 6 when GeV.

As noted from the analytic formulas, the effective mass parameter in the singlet fermion dominated case, being inversely proportional to , will proportionately decrease with increasing value of the mediating particle mass. This feature has been shown in Figure 7. We present predictions of double beta decay half-life as a function of the singlet fermion mass in Figure 8. It is clear that while for GeV the half-life saturates the current experimental limit, for larger values of the half-life is found to increase. Neglecting heavy RH contributions but including those due to the lightest sterile neutrino and the IH type light neutrinos, our predictions of half-life as a function of the lightest sterile neutrino mass are shown in Figure 9.

Figure 8

Prediction of double beta decay half-life as a function of sterile neutrino mass GeV (blue shaded curve) where the NH type light neutrino and the sterile neutrino exchange contributions have been included. Effects of much larger masses have been neglected. The spread in the curve reflects uncertainty in the virtuality momentum MeV. For comparison, the standard prediction with NH and IH pattern of light neutrino mass hierarchies is shown by the two respective horizontal lines. The bottom most thick red horizontal line closest to the X-axis represents overlapping experimental bounds from different groups [78–82].

Predicted lifetimes are seen to decrease with increasing sterile neutrino mass. The sterile neutrino exchange contribution completely dominates over light neutrino exchange contributions for GeV in case of IH but for GeV in case of NH. At both types of solutions saturate the current laboratory limits reached by different experimental groups.

8. Summary, Discussion, and Conclusion

A recently proposed scalar extension of minimal non-SUSY GUT has been found to realize precision gauge coupling unification, high scale type-II seesaw ansatz for neutrino masses, and prediction of a WIMP scalar DM candidate that also completes vacuum stability of the scalar potential. But the LFV decays are predicted to have negligible rates inaccessible to ongoing searches in foreseeable future. Likewise experimentally verifiable double beta decay rates measurable by different search experiments are possible only for quasidegenerate neutrino mass spectrum with large common mass scale eV or eV. This violates the recently measured cosmological bound eV. In order to remove these theoretical shortcomings in the context of , we have extended this model by the addition of three RHs, three extra Majorana fermion singlets , and a scalar singlet that generates mixing mass term through its vacuum expectation value. In the original theory of type-I seesaw cancellation mechanism, although the choice of particles is the same as , , and , the neutrino mass is given by double seesaw [119]. Further, there is no grand unification of gauge couplings or prediction of proton decay in this model [119], and the scalar potential of the model has vacuum instability. In addition the are not gauged. The model does not predict dominant contributions to double beta decay for NH or IH type neutrino masses. In non-SUSY models of unification of three forces implementing the cancellation of type-I seesaw [84, 120, 124], the TeV scale RH neutrinos are gauged but the neutrino masses are controlled by inverse seesaw. But in [13, 125] the RHs are gauged and the neutrino mass formula is linear seesaw or type-II seesaw [13]. In all type-II seesaw dominated models, the RH masses have the same hierarchy as the left-handed neutrino masses: . This happens precisely because the left-handed and the right-handed dilepton Yukawa interactions originate from the same invariant term: . In , however, as the LH triplet generating type-II seesaw and the singlet generating RHs belong to different scalar representations, and , respectively, they can possess different Majorana couplings in their respective Yukawa interactions: and . Because of this reason the generated RH masses through no longer follows the predicted type-II seesaw predicted hierarchical pattern. Then the allowed fine-tuning permits RH neutrino mass scale TeV even though, unlike models, there are no possibilities of low mass or bosons at this scale. The apprehension of unacceptably large active neutrino mass generation through type-I seesaw mechanism is rendered inoperative through the well-established procedure of cancellation mechanism that is also shown to operate profoundly in this model. Such RHs generating mixing mass GeV now reproduce the well-known results on LFV decay branching ratios only orders lower than the current experimental limit as well as the extensively investigated nonunitarity effects. Through the sterile neutrino canonical seesaw formula emerging from this cancellation mechanism (in the presence of ), , this mechanism predicts their masses over a wide range of values, GeV and GeV. The lightest sterile neutrino mass now predicts dominant double beta decay in the channel through the mixing close to the current experimental limits even though the light neutrino masses are of NH or IH type ( eV) which satisfy the cosmological bound. For larger values of the predicted decay rate decreases and the sterile neutrino contribution becomes negligible for GeV. In the limiting case when all the singlet fermion masses have such large values, the double beta decay rates asymptotically approach the respective standard NH or IH type contributions. The new mechanism of RH mass generation also allows the second and the third generation sterile neutrino masses to be quasidegenerate (QD) near TeV scale while keeping GeV suitable for dominant double beta decay mediation. There is a possibility that such TeV scale QD masses while maintaining observable predictions on LFV decays can effectively generate baryon asymmetry of the universe via resonant leptogenesis [125]. A scalar singlet DM can be easily accommodated as discussed in [126, 165, 166] while resolving the issue of vacuum stability. Irrespective of scalar DM, the model can also accommodate a Majorana fermion singlet dark matter [167] which can emerge from the additional fermionic representation .

The prediction of new fermions has an additional advantage over scalars as these masses are protected by leptonic global symmetries [168]. Also the prediction of such Majorana type sterile neutrinos can be tested by high energy and high luminosity accelerators through their like-sign dilepton production processes [169]. For example, at LHC they can mediate the process where the jets could be manifested as mesons. It would be quite interesting to examine emergence of such theory as a remnant of or GUTs.

We conclude that even in the presence of SM as effective gauge theory descending from a suitable extension, it is possible to predict experimentally accessible double beta decay rates in the channel satisfying the cosmological bound on active neutrino masses as well as verifiable LFV decays. The RH masses can be considerably different from those constrained by conventional type-I or type-II seesaw frameworks which are instrumental in predicting interesting physical phenomena even if there are no nonstandard heavy gauge bosons anywhere below the GUT scale.

Appendix

A. Diagonalization, Masses, and Mixings

The purpose of this Appendix is to provide certain details of mixings among the fermions , , and and also derive their masses by block diagonalization of the resulting neutral fermion mass matrix discussed in Section 3. We write the complete mass matrix in the flavor basis after the effect of is integrated out where the type-II seesaw contribution has been noted as . The flavor basis to mass basis transformation and diagonalization of is achieved by a unitary transformation matrix defined belowwhere subscripts denote the flavor and mass basis, respectively. Also is the mass matrix in flavor basis with running over three generations of light neutrinos, sterile neutrinos, and right-handed heavy-neutrinos. Here is the diagonal mass matrix with running over corresponding mass states at the sub-eV, GeV, and TeV scales, respectively.

The method of complete diagonalization will be carried out in two steps: the full neutrino mass matrix has to be reduced to a block diagonalized form as ; this block diagonal form is further diagonalized to give physical masses of the neutral leptons .

(1) Determination of . We shall follow the parametrisation of the type given in [32] to determine the form of the diagonalizing matrices and . We define their product as where and satisfy where and are the intermediate block diagonal and full block diagonal mass matrices, respectively.

(2) Determination of . We need to first integrate out the heavy state (), being heavier than other mass scales in our theory, such that up to the leading order approximation the analytic expression for is where the matrix is dimensional and is described aswhere , , and so that .

Therefore, the transformation matrix can be written purely in terms of dimensionless parameters and while the light and heavy states can be now written as follows.

Determination of . From the above discussion, it is quite clear now that the eigenstates are eventually decoupled from others and the remaining mass matrix can be block diagonalized using another transformation matrix such that In a simplified structure, Under the assumption at the beginning and of course , this structure is similar to type-(I+II) seesaw. Therefore we immediately get the light neutrino masses as follows. We see that in addition to , the is also almost diagonal if and are assumed to be diagonal. The transformation matrix issuch that The block diagonal mixing matrix has the following form.

A.1. Physical Neutrino Masses from Complete Diagonalization

The block diagonal matrices , , and can further be diagonalized to give physical masses for all neutral leptons by a unitary matrix asHere the unitary matrices , , and satisfy the following.With this discussion, the complete mixing matrix is as follows.It is straightforward to verify that the matrix product of the right-hand side of (A.24) agrees with (18) of Section 3.

Data Availability

The data used to support the findings of this study are included within the article.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this manuscript.

Acknowledgments

M. K. Parida thanks the Science and Engineering Research Board, Department of Science and Technology, Government of India, for grant of research project SB/S2/HEP-011/2013. Rajesh Satpathy thanks Siksha ’O’ Anusandhan University for research fellowship.

References

P. F. de Salas, D. V. Forero, C. A. Ternes, M. Tortola, and J. W. F. Valle, “Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity,” Physics Letters B, vol. 782, pp. 633–640, 2018.
View at: Publisher Site | Google Scholar
T. Schwetz, M. Tórtola, and J. W. Valle, “Global neutrino data and recent reactor fluxes: the status of three-flavour oscillation parameters,” New Journal of Physics, vol. 13, no. 6, Article ID 063004, 2011.
View at: Publisher Site | Google Scholar
D. Forero, M. Tortola, and J. Valle, “Neutrino oscillations refitted,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 90, no. 9, Article ID 093006, 10 pages, 2014.
View at: Publisher Site | Google Scholar
G. L. Fogli, E. Lisi, A. Marrone, D. Montanino, A. Palazzo, and A. M. Rotunno, “Global analysis of neutrino masses, mixings and phases: entering the era of leptonic CP violation searches,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 86, Article ID 013012, 2012.
View at: Publisher Site | Google Scholar
M. C. Gonzalez-Garcia, M. Maltoni, and T. Schwetz, “Global analyses of neutrino oscillation experiments,” Nuclear Physics B, vol. 908, pp. 199–217, 2016.
View at: Publisher Site | Google Scholar
G. Altarelli, “Neutrinos Today: An Introduction,” in Proceedings of the 49th Recontres de Moriond on Electroweak Interactons and Unified Theories, pp. 15–22, La Thuile, Italy, 2014.
View at: Google Scholar
A. Y. Smirnov, “Theories of Neutrino Masses and Mixings,” Il Nuovo Cimento C, vol. 37, no. 3, p. 29, 2014.
View at: Google Scholar
R. N. Mohapatra, “From old symmetries to new symmetries: Quarks, leptons and B - L,” in 50 Years of Quarks, pp. 245–263, World Scientific, 2015.
View at: Google Scholar
R. N. Mohapatra, “Neutrino mass as a signal of TeV scale physics,” Nuclear Physics B, vol. 908, pp. 423–435, 2016.
View at: Publisher Site | Google Scholar | Zentralblatt MATH
O. G. Miranda and J. W. Valle, “Neutrino oscillations and the seesaw origin of neutrino mass,” Nuclear Physics B, vol. 908, pp. 436–455, 2016.
View at: Publisher Site | Google Scholar | MathSciNet
J. W. Valle, “Neutrino physics from A to Z : Two lectures at Corfu,” in Proceedings of the Corfu Summer Institute 2016 "School and Workshops on Elementary Particle Physics and Gravity", p. 7, Corfu, Greece, August 2016.
View at: Publisher Site | Google Scholar
G. Senjanovic, “Neutrino mass: From LHC to grand unification,” La Rivista del Nuovo Cimento, vol. 34, pp. 1–68, 2011.
View at: Google Scholar
M. K. Parida and B. P. Nayak, “Singlet fermion assisted dominant seesaw with lepton flavor and number violations and leptogenesis,” Advances in High Energy Physics, vol. 2017, Article ID 4023493, 24 pages, 2017.
View at: Publisher Site | Google Scholar
P. Minkowski, “μ→eγ at a rate of one out of 10⁹ muon decays?” Physics Letters B, vol. 67, pp. 421–428, 1977.
View at: Publisher Site | Google Scholar
T. Yanagida, “Horizontal Gauge Symmetry and Masses of Neutrinos,” in Proceedings of the Workshop on the Unified Theories and Baryon Number in the Universe, O. Sawada and E. Sugamoto, Eds., Tsukuba, Japan, 1979, KEK Report:KEK-79-18-95.
View at: Publisher Site | Google Scholar
M. Gell-Mann, P. Ramond, and R. Slansky, “Complex Spinors and Unified Theories,” in Proceedings of the Conference: C79-09-27 (Stony Brook Supergravity Workshop 1979:0315), p. 315, Supergravity, Amsterdam, North Holland, 1979.
View at: Google Scholar
S. L. Glashow, 1979 Cargese Summer Institute on Quarks and Leptons, Plenum, New York, NY, USA, 1979.
R. N. Mohapatra and G. Senjanovic, “Neutrino mass and spontaneous parity nonconservation,” Physical Review Letters, vol. 44, p. 912, 1980.
View at: Publisher Site | Google Scholar
J. Schechter and J. W. F. Valle, “Neutrino masses in SU(2) ⊗ U(1) theories,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 22, article 2227, 1980.
View at: Publisher Site | Google Scholar
J. Schechter and J. W. F. Valle, “Neutrinoless double-β decay in su(2) x u(1) theories,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 25, no. 11, article 2951, 1982.
View at: Publisher Site | Google Scholar
M. Magg and C. Wetterich, “Neutrino mass problem and gauge hierarchy,” Physics Letters B, vol. 94, pp. 61–64, 1980.
View at: Publisher Site | Google Scholar
G. Lazarides, Q. Shafi, and C. Wetterich, “Proton lifetime and fermion masses in an SO(10) model,” Nuclear Physics Section B, vol. 181, no. 2, pp. 287–300, 1981.
View at: Publisher Site | Google Scholar
R. N. Mohapatra and G. Senjanović, “Neutrino masses and mixings in gauge models with spontaneous parity violation,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 23, article 165, 1981.
View at: Publisher Site | Google Scholar
R. N. Mohapatra and M. K. Parida, “Type-II seesaw dominance in nonsupersymmetric and split-supersymmetry SO(10) models and proton lifetime,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 84, no. 9, Article ID 095021, 2011.
View at: Publisher Site | Google Scholar
R. N. Mohapatra, “Mechanism for understanding small neutrino mass in superstring theories,” Physical Review Letters, vol. 56, no. 6, pp. 561–563, 1986.
View at: Publisher Site | Google Scholar
R. N. Mohapatra and J. W. F. Valle, “Neutrino mass and baryon-number nonconservation in superstring models,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 34, no. 5, pp. 1642–1645, 1986.
View at: Publisher Site | Google Scholar
D. Wyler and L. Wolfenstein, “Massless neutrinos in left-hand symmetric models,” Nuclear Physics B, vol. 218, no. 1, pp. 205–214, 1983.
View at: Publisher Site | Google Scholar
C. H. Albright, “Search for a solution of the superstring neutrino mass problem without a high intermediate energy scale,” Physics Letters B, vol. 178, no. 2-3, pp. 219–225, 1986.
View at: Publisher Site | Google Scholar
S. Nandi and U. Sarkar, “Solution to the neutrino-mass problem in superstring E6 theory,” Physical Review Letters, vol. 56, no. 6, pp. 564–567, 1986.
View at: Publisher Site | Google Scholar
E. Witten, “New issues in manifolds of SU(3) holonomy,” Nuclear Physics B, vol. 268, no. 1, pp. 79–112, 1986.
View at: Publisher Site | Google Scholar | MathSciNet
E. Ma, “Lepton-number nonconservation in E6 superstring models,” Physics Letters B, vol. 191, no. 3, pp. 287–289, 1987.
View at: Publisher Site | Google Scholar
W. Grimus and L. Lavoura, “The seesaw mechanism at arbitrary order: disentangling the small scale from the large scale,” Journal of High Energy Physics, vol. 2000, no. 11, article no. 42, 2000.
View at: Publisher Site | Google Scholar
E. K. Akhmedov and M. Frigerio, “Duality in Left-Right Symmetric Seesaw Mechanism,” Physical Review Letters, vol. 96, no. 6, Article ID 061802, 2006.
View at: Publisher Site | Google Scholar
E. K. Akhmedov and M. Frigerio, “Interplay of type I and type II seesaw contributions to neutrino mass,” Journal of High Energy Physics, vol. 2007, no. 1, article no. 04, 2007.
View at: Publisher Site | Google Scholar | MathSciNet
M. K. Parida, B. P. Nayak, R. Satpathy, and R. L. Awasthi, “Standard Coupling Unification in SO(10), Hybrid Seesaw Neutrino Mass and Leptogenesis, Dark Matter, and Proton Lifetime Predictions,” Journal of High Energy Physics, vol. 2017, no. 4, article no. 75, 2017.
View at: Publisher Site | Google Scholar
E. Akhmedova, M. Lindnerb, E. Schnapkab, and J. Vallec, “Left-right symmetry breaking in NJL approach,” Physics Letters B, vol. 368, no. 4, pp. 270–280, 1996.
View at: Publisher Site | Google Scholar
M. Malinsky, J. Romao, and J. Valle, “Novel supersymmetric SO(10) seesaw mechanism,” Physical Review Letters, vol. 95, Article ID 161801, 2005.
View at: Publisher Site | Google Scholar
S. M. Barr, “New Type of Seesaw Mechanism for Neutrino Masses,” Physical Review Letters, vol. 92, no. 10, Article ID 101601, 2004.
View at: Publisher Site | Google Scholar
E. Ma, “Verifiable radiative seesaw mechanism of neutrino mass and dark matter,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 73, Article ID 077301, 2006.
View at: Publisher Site | Google Scholar
M. K. Parida, “Radiative Seesaw in SO(10) with Dark Matter,” Physics Letters B, vol. 704, p. 206, 2011.
View at: Google Scholar
M. K. Parida, “Radiative see-saw formula in nonsupersymmetric SO(10) with dark matter,” Pramana—Journal of Physics, vol. 79, no. 5, pp. 1271–1274, 2012.
View at: Publisher Site | Google Scholar
R. Foot, H. Lew, X. G. He, and G. C. Joshi, “See-saw neutrino masses induced by a triplet of leptons,” Zeitschrift für Physik C: Particles and Fields, vol. 44, no. 3, pp. 441–444, 1989.
View at: Publisher Site | Google Scholar
B. Bajc and G. Senjanovic, “Seesaw at LHC,” Journal of High Energy Physics. A SISSA Journal, vol. 2007, no. 08, article no. 014, 2007.
View at: Publisher Site | Google Scholar | MathSciNet
J. C. Pati and A. Salam, “Lepton number as the fourth 'color',” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 10, pp. 275–289, 1975, Erratum: Physical Review D, vol. 11, p. 703, 1975.
View at: Publisher Site | Google Scholar
R. N. Mohapatra and J. C. Pati, “Left-right gauge symmetry and an ‘isoconjugate’ model of CP violation,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 11, pp. 566–571, 1975.
View at: Publisher Site | Google Scholar
G. Senjanović and R. N. Mohapatra, “Spontaneous breakdown of parity in a class of gauge theories,” Physics Review D, vol. 12, p. 1502, 1975.
View at: Google Scholar
G. Senjanović, “Spontaneous breakdown of parity in a class of gauge theories,” Nuclear Physics B, vol. 153, no. 3-4, pp. 334–364, 1979.
View at: Publisher Site | Google Scholar | MathSciNet
H. Georgi, “Particles and Fields,” in Proceedings of APS Division Particles and Fields, C. Carlson, Ed., p. 575, American Institute of Physics, New York, NY, USA, 1975.
View at: Google Scholar
H. Fritzsch and P. Minkowski, “Unified interactions of leptons and hadrons,” Annals of Physics, vol. 93, no. 1-2, pp. 193–266, 1975.
View at: Publisher Site | Google Scholar | MathSciNet
K. S. Babu and R. N. Mohapatra, “Predictive neutrino spectrum in minimal SO(10) grand unification,” Physical Review Letters, vol. 70, no. 19, pp. 2845–2848, 1993.
View at: Publisher Site | Google Scholar
A. S. Joshipura and K. M. Patel, “Fermion masses in SO(10) model,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 83, no. 9, Article ID 095002, 17 pages, 2011.
View at: Publisher Site | Google Scholar
G. Altarelli and G. Blankenburg, “Different SO(10) paths to fermion masses and mixings,” Journal of High Energy Physics, vol. 2011, no. 3, article no. 133, 2011.
View at: Publisher Site | Google Scholar
S. Bertolini, T. Schwetz, and M. Malinský, “Fermion masses and mixings in SO(10) models and the neutrino challenge to supersymmetric grand unified theories,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 73, no. 11, Article ID 115012, 2006.
View at: Publisher Site | Google Scholar
M. K. Parida, “Intermediate left-right gauge symmetry, unification of couplings and fermion masses in SUSY SO(10)XS(4),” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 78, no. 5, Article ID 053004, 2008.
View at: Publisher Site | Google Scholar
H. S. Goh, R. N. Mohapatra, and S. Nasri, “SO(10) symmetry breaking and type II seesaw formula,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 70, no. 7, Article ID 075022, 2004.
View at: Publisher Site | Google Scholar
D. Chang, R. N. Mohapatra, and M. K. Parida, “Decoupling of parity- and SU(2)R-breaking scales: a new approach to left-right symmetric models,” Physical Review Letters, vol. 52, no. 13, pp. 1072–1075, 1984.
View at: Publisher Site | Google Scholar
D. Chang, R. N. Mohapatra, and M. K. Parida, “New approach to left-right-symmetry breaking in unified gauge theories,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 30, no. 5, article 1052, 1984.
View at: Publisher Site | Google Scholar
D. Chang, R. N. Mohapatra, J. M. Gipson, R. E. Marshak, and M. K. Parida, “Experimental tests of new SO(10) grand unification,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 31, no. 7, pp. 1718–1732, 1985.
View at: Publisher Site | Google Scholar
D. Chang, R. N. Mohapatra, and M. K. Parida, “New mechanism for baryon generation in SO(10) models with low mass WR-boson,” Physics Letters B, vol. 142, no. 1-2, pp. 55–58, 1984.
View at: Publisher Site | Google Scholar
M. K. Parida, “Natural mass scales for observable matter-antimatter oscillations in SO(10),” Physics Letters B, vol. 126, no. 3-4, pp. 220–224, 1983.
View at: Publisher Site | Google Scholar
M. K. Parida, “Matter-antimatter oscillations in grand unified theories with high unification masses,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 27, no. 11, pp. 2783–2786, 1983.
View at: Publisher Site | Google Scholar
M. K. Parida and P. K. Patra, “Useful theorem on vanishing threshold contribution to sin²θ_W in a class of grand unified theories,” Physical Review Letters, vol. 66, no. 7, pp. 858–861, 1991.
View at: Publisher Site | Google Scholar
M. K. Parida and P. K. Patra, “Theorem on vanishing multiloop radiative corrections to sin²θ_W in grand unified theories at high mass scales,” Physical Review Letters, vol. 68, no. 6, pp. 754–756, 1992.
View at: Publisher Site | Google Scholar
M. K. Parida, “Vanishing corrections on an intermediate scale and implications for unification of forces,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 57, no. 5, p. 2762, 1998.
View at: Publisher Site | Google Scholar
R. N. Mohapatra, “A theorem on the threshold corrections in grand unified theories,” Physics Letters B, vol. 285, no. 3, pp. 235–237, 1992.
View at: Publisher Site | Google Scholar
N. G. Deshpande, E. Keith, and P. B. Pal, “Implications of the CERN LEP results for SO(10) grand unification,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 47, no. 5, pp. 2261–2264, 1992.
View at: Publisher Site | Google Scholar
T. W. B. Kibble, G. Lazarides, and Q. Shafi, “Walls bounded by strings,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 26, no. 2, pp. 435–439, 1982.
View at: Publisher Site | Google Scholar
Q. Shafi and C. Wetterich, “Modification of Predictions of Grand Unified Theories in the Presence of Spontaneous Compactification,” Physical Review Letters, vol. 52, no. 11, pp. 875–878, 1984.
View at: Publisher Site | Google Scholar
S. Bertolini, L. Di Luzio, and M. Malinský, “Intermediate mass scales in the nonsupersymmetric SO(10) grand unification: A reappraisal,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 80, no. 1, Article ID 015013, 2009.
View at: Publisher Site | Google Scholar
S. K. Majee, M. K. Parida, A. Raychaudhuri, and U. Sarkar, “Low intermediate scales for leptogenesis in supersymmetric SO(10) grand unified theories,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 75, no. 7, Article ID 075003, 2007.
View at: Publisher Site | Google Scholar
J. Chakraborty, S. K. Patra, and S. Mohanty, “Roadmap of left-right models based on GUTs,” Physics Review D, vol. 97, no. 9, Article ID 095010, 2018.
View at: Publisher Site | Google Scholar
M. K. Parida and A. Raychaudhuri, “Low-mass parity restoration, weak-interaction phenomenology, and grand unification,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 26, no. 9, pp. 2364–2377, 1982.
View at: Publisher Site | Google Scholar
M. Reig, J. W. Valle, C. Vaquera-Araujo, and F. Wilczek, “A model of comprehensive unification,” Physics Letters B, vol. 774, pp. 667–670, 2017.
View at: Publisher Site | Google Scholar
S. Fukuyama and T. Yanagida, “Barygenesis without grand unification,” Physics Letters B, vol. 174, no. 1, pp. 45–47, 1986.
View at: Publisher Site | Google Scholar
T. Hambye, E. Ma, and U. Sarkar, “Supersymmetric triplet Higgs model of neutrino masses and leptogenesis,” Nuclear Physics B, vol. 602, no. 1-2, pp. 23–38, 2001.
View at: Publisher Site | Google Scholar
T. Hambye and G. Senjanović, “Consequences of triplet seesaw for leptogenesis,” Physics Letters B, vol. 582, pp. 73–81, 2004.
View at: Publisher Site | Google Scholar
G. D'Ambrosio, T. Hambye, A. Hektor, M. Raidal, and A. Rossi, “Leptogenesis in the minimal supersymmetric triplet seesaw model,” Physics Letters B, vol. 604, no. 3-4, pp. 199–206, 2004.
View at: Publisher Site | Google Scholar
H. V. Klapdor-Kleingrothaus, A. Dietz, L. Baudis et al., “Latest results from the Heidelberg-Moscow double beta decay experiment,” The European Physical Journal A, vol. 12, no. 2, pp. 147–154, 2001.
View at: Publisher Site | Google Scholar
C. Arnaboldi, D. R. Artusa, F. T. Avignone et al., “Results from a search for the 0 neutrino beta beta-decay of Te-130,” Physics Review C, vol. 78, Article ID 035502, 27 pages, 2008.
View at: Publisher Site | Google Scholar
C. E. Aalseth et al., “The IGEX Ge-76 neutrinoless double beta decay experiment: Prospects for next generation experiments,” Physical Review D, vol. 65, Article ID 092007, 2002.
View at: Publisher Site | Google Scholar
J. Argyriades, R. Arnold, C. Augier et al., “Measurement of the double beta decay half-life of Nd-150 and search for neutrinoless decay modes with NEMO-3 detector,” Physics Review C, vol. 80, Article ID 032501, 2009.
View at: Publisher Site | Google Scholar
I. Abt, M. F. Altmann, A. Bakalyarov et al., “A New Ge76 Double Beta Decay Experiment at LNGS: Letter of Intent,” https://arxiv.org/abs/hep-ex/0404039.
View at: Google Scholar
M. Nemevšek, G. Senjanović, and V. Tello, “Connecting Dirac and Majorana Neutrino Mass Matrices in the Minimal Left-Right Symmetric Model,” Physical Review Letters, vol. 110, no. 15, 2013.
View at: Publisher Site | Google Scholar
M. K. Parida and B. Sahoo, “Planck-scale induced left–right gauge theory at LHC and experimental tests,” Nuclear Physics B, vol. 906, pp. 77–104, 2016.
View at: Publisher Site | Google Scholar | MathSciNet
W.-Y. Keung and G. Senjanović, “Majorana neutrinos and the production of the right-handed charged gauge boson,” Physical Review Letters, vol. 50, no. 19, pp. 1427–1430, 1983.
View at: Publisher Site | Google Scholar
J. W. F. Valle, “Neutrinoless double-β decay with quasi-Dirac neutrinos,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 27, no. 7, pp. 1672–1674, 1983.
View at: Publisher Site | Google Scholar
J. Schechter and J. W. F. Valle, “Neutrino decay and spontaneous violation of lepton number,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 25, p. 774, 1982.
View at: Publisher Site | Google Scholar
G. Gelmini, D. N. Schramm, and J. W. F. Valle, “Majorons: A simultaneous solution to the large and small scale dark matter problems,” Physics Letters B, vol. 146, no. 5, pp. 311–317, 1984.
View at: Publisher Site | Google Scholar
G. B. Gelmini and J. W. F. Valle, “Fast invisible neutrino decays,” Physics Letters B, vol. 142, no. 3, pp. 181–187, 1984.
View at: Publisher Site | Google Scholar
J. W. F. Valle, “Leptonic CP violation and left-right symmetry,” Physics Letters B, vol. 138, no. 1-3, pp. 155–158, 1984.
View at: Publisher Site | Google Scholar
V. Berezinsky and J. W. F. Valle, “The keV majoron as a dark matter particle,” Physics Letters B, vol. 318, no. 2, pp. 360–366, 1993.
View at: Publisher Site | Google Scholar
P. A. Ade, N. Aghanim, M. Arnaud et al., “Planck 2015 results. XIII. Cosmological parameter,” Astronomy & Astrophysics, vol. 594, no. article A13, 63 pages, 2016.
View at: Publisher Site | Google Scholar
J. W. Valle and C. Vaquera-Araujo, “Dynamical seesaw mechanism for Dirac neutrinos,” Physics Letters B, vol. 755, pp. 363–366, 2016.
View at: Publisher Site | Google Scholar
J. Bernabeu, A. Santamaria, J. Vidal, A. Mendez, and J. W. F. Valle, “Lepton flavour non-conservation at high energies in a superstring inspired standard model,” Physics Letters B, vol. 187, pp. 303–308, 1987.
View at: Publisher Site | Google Scholar
J. Adam, X. Bai, A. M. Baldini et al., “New limit on the lepton-flavour violating decay μ+→e+γ,” Physical Review Letters, vol. 107, Article ID 171801, 2011.
View at: Publisher Site | Google Scholar
K. Hayasaka, K. Abe, and I. Adachi, “New Search for tau -> mu gamma and tau -> e gamma Decays at Belle,” Physics Letters B, vol. 666, no. 1, pp. 16–22, 2008.
View at: Publisher Site | Google Scholar
M. L. Brooks, Y. K. Chen, M. D. Cooper et al., “New Limit for the Lepton-Family-Number Nonconserving Decay μ+→e+γ,” Physics Review Letters, vol. 83, p. 1521, 1999.
View at: Google Scholar
B. Aubert, Y. Karyotakis, J. P. Lees et al., “Searches for Lepton Flavor Violation in the Decays tau -> e gamma and tau -> mu gamma,” Physics Review Letters, vol. 104, Article ID 021802, 2010.
View at: Publisher Site | Google Scholar
Y. Kuno, “Prism/prime,” Nuclear Physics B—Proceedings Supplements, vol. 149, pp. 376–378, 2005.
View at: Publisher Site | Google Scholar
F. R. Joaquim and A. Rossi, “Phenomenology of the triplet seesaw mechanism with Gauge and Yukawa mediation of SUSY breaking,” Nuclear Physics B, vol. 765, no. 1-2, pp. 71–117, 2007.
View at: Publisher Site | Google Scholar
A. Ilakovac and A. Pilaftsis, “Flavour-violating charged lepton decays in seesaw-type models,” Nuclear Physics B, vol. 437, no. 3, pp. 491–519, 1995.
View at: Publisher Site | Google Scholar
F. Deppisch and J. W. F. Valle, “Enhanced lepton flavour violation in the supersymmetric inverse seesaw model,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 72, Article ID 036001, 2005.
View at: Publisher Site | Google Scholar
C. Arina, F. Bazzocchi, N. Fornengo, J. C. Romao, and J. W. Valle, “Minimal supergravity scalar neutrino dark matter and inverse seesaw neutrino masses,” Physical Review Letters, vol. 101, no. 16, Article ID 161802, 2008.
View at: Publisher Site | Google Scholar
M. Malinský, T. Ohlsson, Z.-Z. Xing, and H. Zhang, “Non-unitary neutrino mixing and CP violation in the minimal inverse seesaw model,” Physics Letters B, vol. 679, no. 3, pp. 242–248, 2009.
View at: Publisher Site | Google Scholar
M. Hirsch, T. Kernreiter, J. Romao, and A. Villanova del Moral, “Minimal supersymmetric inverse seesaw: neutrino masses, lepton flavour violation and LHC phenomenology,” Journal of High Energy Physics, vol. 2010, no. 10, article 103, 2010.
View at: Publisher Site | Google Scholar
F. Deppisch, T. S. Kosmas, and J. W. F. Valle, “Enhanced conversion in nuclei in the inverse seesaw model,” Nuclear Physics B, vol. 752, pp. 80–92, 2006.
View at: Publisher Site | Google Scholar
S. Das, F. Deppisch, O. Kittel, and J. Valle, “Heavy neutrinos and lepton flavor violation in left-right symmetric models at the LHC,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 86, Article ID 055006, 2012.
View at: Publisher Site | Google Scholar
S. Antusch, J. Baumann, and E. Fernández-Martínez, “Non-standard neutrino interactions with matter from physics beyond the Standard Model,” Nuclear Physics B, vol. 810, no. 1-2, pp. 369–388, 2009.
View at: Publisher Site | Google Scholar
S. Antush, C. Biggio, E. Fernandez-Martinez, M. Belen Gavela, and J. Lopez-Pavon, “Unitarity of the leptonic mixing matrix,” Journal of High Energy Physics, vol. 2006, no. 10, p. 84, 2006.
View at: Publisher Site | Google Scholar
D. Forero, S. Morisi, M. Tortola, and J. W. F. Valle, “Lepton flavor violation and non-unitary lepton mixing in low-scale type-I seesaw,” Journal of High Energy Physics, vol. 2011, no. 9, article 142, 2011.
View at: Publisher Site | Google Scholar
E. Fernández-Martínez, M. Gavela, J. López-Pavón, and O. Yasuda, “CP-violation from non-unitary leptonic mixing,” Physics Letters B, vol. 649, no. 5-6, pp. 427–435, 2007.
View at: Publisher Site | Google Scholar
K. Kanaya, “Neutrino mixing in the minimal SO(10) model,” Progress of Theoretical and Experimental Physics, vol. 64, no. 6, pp. 2278–2281, 1980.
View at: Publisher Site | Google Scholar
J. Kersten and A. Y. Smirnov, “Right-Handed Neutrinos at CERN LHC and the Mechanism of Neutrino Mass Generation,” Physics Review D, vol. 76, Article ID 073005, 2007.
View at: Google Scholar
M. Malinsky, T. Ohlsson, and H. Zhang, “Nonunitarity effects in a realistic low-scale seesaw model,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 79, no. 7, Article ID 073009, 2009.
View at: Publisher Site | Google Scholar
G. Altarelli and D. Meloni, “CP violation in neutrino oscillations and new physics,” Nuclear Physics B, vol. 809, no. 1-2, pp. 158–182, 2009.
View at: Publisher Site | Google Scholar
F. del Aguila and J. A. Aguilar-Saavedra, “Electroweak scale seesaw and heavy Dirac neutrino signals at LHC,” Physics Letters B, vol. 672, no. 2, pp. 158–165, 2009.
View at: Publisher Site | Google Scholar
F. del Aguila, J. A. Aguilar-Saavedra, and J. de Blas, “Trilepton signals: the golden channel for seesaw searches at LHC,” Acta Physica Polonica B, vol. 40, pp. 2901–2911, 2009.
View at: Google Scholar
A. Van Der Schaaf, “Muon physics at a neutrino factory,” Journal of Physics G: Nuclear and Particle Physics, vol. 29, no. 12, pp. 2755–2762, 2003.
View at: Publisher Site | Google Scholar
S. K. Kang and C. S. Kim, “Extended double seesaw model for neutrino mass spectrum and low scale leptogenesis,” Physics Letters B, vol. 646, no. 5-6, pp. 248–252, 2007.
View at: Publisher Site | Google Scholar
R. L. Awasthi, M. K. Parida, and S. Patra, “Neutrino masses, dominant neutrinoless double beta decay, and observable lepton flavor violation in left-right models and SO(10) grand unification with low mass W_R, Z_R bosons,” Journal of High Energy Physics, vol. 2013, no. 8, article 122, 2013.
View at: Publisher Site | Google Scholar
M. K. Parida and S. Patra, “Left-right models with light neutrino mass prediction and dominant neutrinoless double beta decay rate,” Physics Letters B, vol. 718, no. 4-5, pp. 1407–1412, 2013.
View at: Publisher Site | Google Scholar
S. K. Majee, M. K. Parida, and A. Raychaudhuri, “Neutrino mass and low-scale leptogenesis in a testable SUSY SO(10) model,” Physics Letters B, vol. 668, no. 4, pp. 299–302, 2008.
View at: Google Scholar
M. K. Parida and A. Raychaudhuri, “Inverse see-saw, leptogenesis, observable proton decay and in SUSY SO(10) with heavy WR,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 82, no. 9, Article ID 093017, 2010.
View at: Publisher Site | Google Scholar
M. K. Parida, R. L. Awasthi, and P. K. Sahu, “Proton decay and new contribution to 0ν2β decay in SO(10) with low-mass Z’ boson, observable oscillation, lepton flavor violation, and rare kaon decay,” Journal of High Energy Physics, vol. 2015, no. 01, article 45, 2015.
View at: Publisher Site | Google Scholar
B. P. Nayak and M. K. Parida, “New mechanism for Type-II seesaw dominance in SO(10) with low-mass Z′,RH neutrinos, and verifiable LFV, LNV and proton decay,” The European Physical Journal C, vol. 75, article no. 183, 2015.
View at: Publisher Site | Google Scholar
B. Sahoo, M. Chakraborty, and M. K. Parida, “Neutrino mass, coupling unification, verifiable proton decay, vacuum stability, and wimp dark matter in SU(5),” Advances in High Energy Physics, vol. 2018, 21 pages, 2018.
View at: Publisher Site | Google Scholar
M. L. Kynshi and M. K. Parida, “Higgs scalar in the grand desert with observable proton lifetime in SU(5) and small neutrino masses in SO(10),” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 47, no. 11, pp. R4830–R4834, 1993.
View at: Publisher Site | Google Scholar
J. Beringer, R. M. Barnett, K. Copic et al., “Review of Particle Physics (RPP),” Physics Review D, vol. 86, Article ID 010001, 2012.
View at: Publisher Site | Google Scholar
K. Olive, K. Agashe, and C. Amsler, “Review of Particle Physics (RPP),” Chinese Physics C, vol. 38, no. 9, Article ID 090001, 2014.
View at: Publisher Site | Google Scholar
C. Patrignani, K. Agashe, G. Aielli et al., “Review of Particle Physics (RPP),” Chinese Physics C, vol. 40, no. 10, Article ID 100001, 2016.
View at: Google Scholar
S. Weinberg, “Effective gauge theories,” Physics Letters B, vol. 91, no. 1, pp. 51–55, 1980.
View at: Publisher Site | Google Scholar
L. J. Hall, “Grand unification of effective gauge theories,” Nuclear Physics B, vol. 178, no. 1, pp. 75–124, 1981.
View at: Publisher Site | Google Scholar
B. A. Ovrut and H. J. Schnitzer, “Effective field theory in background field gauge,” Physics Letters B, vol. 110, no. 2, pp. 139–142, 1982.
View at: Publisher Site | Google Scholar
M. K. Parida, “Heavy particle effects in grand unified theories with fine-structure constant matching,” Physics Letters B, vol. 196, no. 2, pp. 163–169, 1987.
View at: Publisher Site | Google Scholar
M. K. Parida and C. C. Hazra, “Superheavy-Higgs-scalar effects in effective gauge theories from SO(10) grand unification with low-mass right-handed gauge bosons,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 40, no. 9, pp. 3074–3085, 1989.
View at: Publisher Site | Google Scholar
R. N. Mohapatra and M. K. Parida, “Threshold effects on the mass-scale predictions in SO(10) models and solar-neutrino puzzle,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 47, no. 1, pp. 264–272, 1993.
View at: Publisher Site | Google Scholar
P. Langacker and N. Polonsky, “Uncertainties in coupling constant unification,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 47, no. 9, pp. 4028–4045, 1993.
View at: Publisher Site | Google Scholar
D.-G. Lee, R. N. Mohapatra, M. K. Parida, and M. Rani, “Predictions for the proton lifetime in minimal nonsupersymmetric SO(10) models: an update,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 51, no. 1, pp. 229–235, 1995.
View at: Publisher Site | Google Scholar
Y. Abe, Y. Haga, M. Hayato et al., “Search for Proton Decay via and in 0.31 megaton·years exposure of the Super-Kamiokande Water Cherenkov Detector,” Physics Review D, vol. 95, no. 1, Article ID 012004, 2017.
View at: Google Scholar
I. Doršner, S. Fajfer, A. Greljo, J. Kamenik, and N. Košnik, “Physics of leptoquarks in precision experiments and at particle colliders,” Physics Reports, vol. 641, pp. 1–68, 2016.
View at: Publisher Site | Google Scholar
I. Doršner, “A scalar leptoquark in SU(5),” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 86, no. 5, Article ID 055009, 2012.
View at: Publisher Site | Google Scholar
I. Doršner, S. Fajfer, and I. Mustać, “Light vector-like fermions in a minimal SU(5) setup,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 89, no. 11, Article ID 115004, 2014.
View at: Publisher Site | Google Scholar
M. K. Parida, P. K. Patra, and A. K. Mohanty, “Gravity-induced large grand-unification mass in SU(5) with higher-dimensional operators,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 39, no. 1, pp. 316–322, 1989.
View at: Publisher Site | Google Scholar
I. Doršner, S. Fajfer, and N. Košnik, “Leptoquark mechanism of neutrino masses within the grand unification framework,” The European Physical Journal C, vol. 77, no. 6, p. 417, 2017.
View at: Publisher Site | Google Scholar
I. Doršner, S. Fajfer, and N. Košnik, “Heavy and light scalar leptoquarks in proton decay,” Physics Review D, vol. 86, Article ID 015013, 2012.
View at: Google Scholar
I. Doršner and P. F. Pérez, “Upper bound on the mass of the type III seesaw triplet in an SU(5) model,” Journal of High Energy Physics, vol. 2007, no. 06, article no. 029, 2007.
View at: Publisher Site | Google Scholar
P. F. Pérez, “Supersymmetric adjoint SU(5),” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 76, no. 7, Article ID 071701, 2007.
View at: Publisher Site | Google Scholar
P. Nath and P. Fileviez Perez, “Proton stability in grand unified theories, in strings and in branes,” Physics Reports, vol. 441, no. 5-6, pp. 191–317, 2007.
View at: Publisher Site | Google Scholar | MathSciNet
P. Langacker, “Grand unified theories and proton decay,” Physics Reports, vol. 72, no. 4, pp. 185–385, 1981.
View at: Publisher Site | Google Scholar
M. H. Rahat, P. Ramond, and B. Xu, “An Asymmetric TBM Texture,” Physics Review D, vol. 98, Article ID 055030, 2018.
View at: Publisher Site | Google Scholar
C. Jarlskog, “Commutator of the quark mass matrices in the standard electroweak model and a measure of maximal CP nonconservation,” Physical Review Letters, vol. 55, p. 1039, 1985.
View at: Publisher Site | Google Scholar
O. W. Greenberg, “Rephasing invariant formulation of CP violation in the Kobayashi-Maskawa framework,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 32, no. 7, pp. 1841–1843, 1985.
View at: Publisher Site | Google Scholar
C. Das and M. Parida, “New formulas and predictions for running fermion masses at higher scales in SM, 2HDM, and MSSM,” The European Physical Journal C, vol. 20, no. 1, pp. 121–137, 2001.
View at: Publisher Site | Google Scholar
M. Parida and B. Purkayastha, “New formulas and predictions for running masses at higher scales in MSSM,” The European Physical Journal C, vol. 14, no. 1, pp. 159–164, 2000.
View at: Publisher Site | Google Scholar
M. K. Parida and N. N. Singh, “Low-energy formulas for neutrino masses with a tan β-dependent hierarchy,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 59, Article ID 032002, 1998.
View at: Publisher Site | Google Scholar
D. Meloni, T. Ohlsson, and S. Riad, “Renormalization group running of fermion observables in an extended non-supersymmetric SO(10) model,” Journal of High Energy Physics, vol. 2017, no. 3, article no. 45, 2017.
View at: Publisher Site | Google Scholar | MathSciNet
R. L. Awasthi and M. K. Parida, “Inverse Seesaw Mechanism in Nonsupersymmetric SO(10), Proton Lifetime, Nonunitarity Effects, and a Low-mass Z’ Boson,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 86, no. 9, Article ID 093004, 2012.
View at: Publisher Site | Google Scholar
G. Pantis, F. Šimkovic, J. D. Vergados, and A. Faessler, “Neutrinoless double beta decay within the quasiparticle random-phase approximation with proton-neutron pairing,” Physical Review C: Nuclear Physics, vol. 53, no. 2, pp. 695–707, 1996.
View at: Publisher Site | Google Scholar
J. Suhonen and O. Civitarese, “Weak-interaction and nuclear-structure aspects of nuclear double beta decay,” Physics Reports C, vol. 300, no. 3-4, p. 123, 1998.
View at: Google Scholar
J. Kotila and F. Iachello, “Phase-space factors for double-β decay,” Physical Review C: Nuclear Physics, vol. 85, no. 3, Article ID 034316, 2012.
View at: Publisher Site | Google Scholar
R. N. Mohapatra, “New contributions to neutrinoless double-beta decay in supersymmetric theories,” Physical Review D: Particles, Fields, Gravitation and Cosmology, vol. 34, no. 11, pp. 3457–3461, 1986.
View at: Publisher Site | Google Scholar
M. Doi, T. Kotani, and E. Takasugi, “The Systematic Structure-Change into the Molecule-like Structures in the Self-Conjugate 4n Nuclei,” Progress of Theoretical Physics Supplement, vol. 83, p. 1, 1985.
View at: Google Scholar
F. Šimkovic, G. Pantis, J. D. Vergados, and A. Faessler, “Additional nucleon current contributions to neutrinoless double β decay,” Physical Review C: Nuclear Physics, vol. 60, Article ID 055502, 1999.
View at: Publisher Site | Google Scholar
A. Pilaftsis and T. E. J. Underwood, “Resonant leptogenesis,” Nuclear Physics B, vol. 692, no. 3, pp. 303–345, 2004.
View at: Publisher Site | Google Scholar
A. Falkowski, C. Gross, and O. Lebedev, “A second Higgs from the Higgs portal,” Journal of High Energy Physics, vol. 2015, no. 5, article no. 057, 2015.
View at: Publisher Site | Google Scholar
B. Sahoo, M. Parida, and M. Chakraborty, “Matter parity violating dark matter decay in minimal SO(10), unification, vacuum stability and verifiable proton decay,” Nuclear Physics B, vol. 938, pp. 56–113, 2019.
View at: Publisher Site | Google Scholar
M. Cirelli, A. Strumia, and M. Tamburini, “Cosmology and astrophysics of minimal dark matter,” Nuclear Physics B, vol. 787, no. 1-2, pp. 152–175, 2007.
View at: Publisher Site | Google Scholar
G. Hooft, “Recent Developments in Gauge Theories,” in Proceedings of the 1979 Cargese Summer Institute on Recent Developments in Gauge Theories, G. Hooft et al., Ed., Plenum Press, New York, NY, USA, 1980.
View at: Google Scholar
B. P. Nayak and M. K. Parida, “Dilepton events with displaced vertices, double beta decay, and resonant leptogenesis with Type-II seesaw dominance, TeV scale Z′ and heavy neutrinos,” https://arxiv.org/abs/1509.06192.
View at: Google Scholar

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Copyright © 2019 M. K. Parida and Rajesh Satpathy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP³.

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