Advances in High Energy Physics
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The latest articles from Hindawi Publishing Corporation
© 2016 , Hindawi Publishing Corporation . All rights reserved.

Decays with Perturbative QCD Approach
Tue, 21 Jun 2016 08:55:15 +0000
http://www.hindawi.com/journals/ahep/2016/4893649/
Besides the traditional strong and electromagnetic decay modes, meson can also decay through the weak interactions within the standard model of elementary particle. With anticipation of copious data samples at the running LHC and coming SuperKEKB experiments, the twobody nonleptonic bottomchanging decays () are investigated with perturbative QCD approach firstly. The absolute branching ratios for and decays are estimated to reach up to about and , respectively, which might possibly be measured by the future experiments.
Junfeng Sun, Yueling Yang, Qin Chang, Gongru Lu, and Jinshu Huang
Copyright © 2016 Junfeng Sun et al. All rights reserved.

Supervariable Approach to the Nilpotent Symmetries for a Toy Model of the Hodge Theory
Mon, 20 Jun 2016 12:59:49 +0000
http://www.hindawi.com/journals/ahep/2016/2618150/
We exploit the standard techniques of the supervariable approach to derive the nilpotent BecchiRouetStoraTyutin (BRST) and antiBRST symmetry transformations for a toy model of the Hodge theory (i.e., a rigid rotor) and provide the geometrical meaning and interpretation to them. Furthermore, we also derive the nilpotent (anti)coBRST symmetry transformations for this theory within the framework of the above supervariable approach. We capture the (anti)BRST and (anti)coBRST invariance of the Lagrangian of our present theory within the framework of augmented supervariable formalism. We also express the (anti)BRST and (anti)coBRST charges in terms of the supervariables (obtained after the application of the (dual)horizontality conditions and (anti)BRST and (anti)coBRST invariant restrictions) to provide the geometrical interpretations for their nilpotency and anticommutativity properties. The application of the dualhorizontality condition and ensuing proper (i.e., nilpotent and absolutely anticommuting) fermionic (anti)coBRST symmetries are completely novel results in our present investigation.
D. Shukla, T. Bhanja, and R. P. Malik
Copyright © 2016 D. Shukla et al. All rights reserved.

Charmless Decays in the QCD Factorization Approach
Wed, 15 Jun 2016 10:51:00 +0000
http://www.hindawi.com/journals/ahep/2016/6314675/
The charmless decays (where and denote the light pseudoscalar and vector mesons, resp.) can occur only via the weak annihilation diagrams within the Standard Model. In this paper, we study these kinds of decays in the framework of QCD factorization, by adopting two different schemes: scheme I is similar to the method usually adopted in the QCD factorization approach, while scheme II is based on the infrared behavior of gluon propagator and running coupling. For comparison, in our calculation, we adopt three kinds of wave functions for meson. The branching ratios based on the two schemes are given. It is found that (a) the predicted branching ratios in scheme I are, however, quite small and almost impossible to be measured at the LHCb experiment and (b) in scheme II, by assigning a dynamical gluon mass to the gluon propagator, we can avoid enhancements of the contribution from soft endpoint region. The strength of annihilation contributions predicted in scheme II is enhanced compared to that obtained in scheme I.
Na Wang
Copyright © 2016 Na Wang. All rights reserved.

On a Search for Hidden Photon CDM by a Multicathode Counter
Wed, 15 Jun 2016 06:46:29 +0000
http://www.hindawi.com/journals/ahep/2016/2058372/
We report a new technique of a multicathode counter (MCC) developed to search for hidden photon (HP) cold dark matter (CDM) with a mass from 5 to 500 eV. The method is suggested in the assumption that HPphoton mixing causes emission of single electrons from a metal cathode if the mass of hidden photon is greater than a work function of the metal . The measured effect from HP should be dependent on and on the structure of electronic shells of the metal used as a cathode. Potentially this can be used for a verification of the results obtained. Some preliminary results for the upper limit for mixing parameter have been obtained for HP with a mass from 5 eV to 10 keV as a pure illustration of the potential of this technique. The efforts are continued to refine the procedure of data treatment and to improve the work of MCC. A new detector with a more developed design is under construction.
A. V. Kopylov, I. V. Orekhov, and V. V. Petukhov
Copyright © 2016 A. V. Kopylov et al. All rights reserved.

Quantum Mechanics on a Curved Snyder Space
Mon, 13 Jun 2016 08:02:57 +0000
http://www.hindawi.com/journals/ahep/2016/1328284/
We study the representations of the threedimensional Euclidean Snyderde Sitter algebra. This algebra generates the symmetries of a model admitting two fundamental scales (Planck mass and cosmological constant) and is invariant under the Born reciprocity for exchange of positions and momenta. Its representations can be obtained starting from those of the Snyder algebra and exploiting the geometrical properties of the phase space that can be identified with a Grassmannian manifold. Both the position and momentum operators turn out to have a discrete spectrum.
Salvatore Mignemi and Rina Štrajn
Copyright © 2016 Salvatore Mignemi and Rina Štrajn. All rights reserved.

Surface and Buildup Region Dose Measurements with Markus ParallelPlate Ionization Chamber, GafChromic EBT3 Film, and MOSFET Detector for HighEnergy Photon Beams
Sun, 12 Jun 2016 09:09:16 +0000
http://www.hindawi.com/journals/ahep/2016/8361028/
The aim of the study was to investigate surface and buildup region doses for 6 MV and 15 MV photon beams using a Markus parallelplate ionization chamber, GafChromic EBT3 film, and MOSFET detector for different field sizes and beam angles. The measurements were made in a water equivalent solid phantom at the surface and in the buildup region of the 6 MV and 15 MV photon beams at 100 cm sourcedetector distance for 5 × 5, 10 × 10, and 20 × 20 cm2 field sizes and 0°, 30°, 60°, and 80° beam angles. The surface doses using 6 MV photon beams for 10 × 10 cm2 field size were found to be 20.3%, 18.8%, and 25.5% for Markus chamber, EBT3 film, and MOSFET detector, respectively. The surface doses using 15 MV photon beams for 10 × 10 cm2 field size were found to be 14.9%, 13.4%, and 16.4% for Markus chamber, EBT3 film, and MOSFET detector, respectively. The surface dose increased with field size for all dosimeters. As the angle of the incident radiation beam became more oblique, the surface dose increased. The effective measurement depths of dosimeters vary; thus, the results of the measurements could be different. This issue can lead to mistakes at surface and buildup dosimetry and must be taken into account.
Ugur Akbas, Nazmiye Donmez Kesen, Canan Koksal, and Hatice Bilge
Copyright © 2016 Ugur Akbas et al. All rights reserved.

The Effect of deSitter Like Background on Increasing the Zero Point Budget of Dark Energy
Wed, 08 Jun 2016 08:49:37 +0000
http://www.hindawi.com/journals/ahep/2016/2594189/
During this work, using subtraction renormalization mechanism, zero point quantum fluctuations for bosonic scalar fields in a deSitter like background are investigated. By virtue of the observed value for spectral index, , for massive scalar field the best value for the first slow roll parameter, , is achieved. In addition, the energy density of vacuum quantum fluctuations for massless scalar field is obtained. The effects of these fluctuations on other components of the universe are studied. By solving the conservation equation, for some different examples, the energy density for different components of the universe is obtained. In the case which all components of the universe are in an interaction, the different dissipation functions, , are considered. The time evolution of shows that has the best agreement in comparison to observational data including CMB, BAO, and SNeIa data set.
Haidar Sheikhahmadi, Ali Aghamohammadi, and Khaled Saaidi
Copyright © 2016 Haidar Sheikhahmadi et al. All rights reserved.

TimeDependent Toroidal Compactification Proposals and the Bianchi Type I Model: Classical and Quantum Solutions
Tue, 07 Jun 2016 12:21:03 +0000
http://www.hindawi.com/journals/ahep/2016/6705021/
We construct an effective fourdimensional model by compactifying a tendimensional theory of gravity coupled with a real scalar dilaton field on a timedependent torus. This approach is applied to anisotropic cosmological Bianchi type I model for which we study the classical coupling of the anisotropic scale factors with the two real scalar moduli produced by the compactification process. Under this approach, we present an isotropization mechanism for the Bianchi I cosmological model through the analysis of the ratio between the anisotropic parameters and the volume of the Universe which in general keeps constant or runs into zero for late times. We also find that the presence of extra dimensions in this model can accelerate the isotropization process depending on the momenta moduli values. Finally, we present some solutions to the corresponding WheelerDeWitt (WDW) equation in the context of standard quantum cosmology.
L. Toledo Sesma, J. Socorro, and O. Loaiza
Copyright © 2016 L. Toledo Sesma et al. All rights reserved.

Thermodynamics of Charged Rotating Dilaton Black Branes Coupled to Logarithmic Nonlinear Electrodynamics
Mon, 06 Jun 2016 11:13:17 +0000
http://www.hindawi.com/journals/ahep/2016/3265968/
We construct a new class of charged rotating black brane solutions in the presence of logarithmic nonlinear electrodynamics with complete set of the rotation parameters in arbitrary dimensions. The topology of the horizon of these rotating black branes is flat, while due to the presence of the dilaton field the asymptotic behavior of them is neither flat nor (anti)de Sitter [(A)dS]. We investigate the physical properties of the solutions. The mass and angular momentum of the spacetime are obtained by using the counterterm method inspired by AdS/CFT correspondence. We derive temperature, electric potential, and entropy associated with the horizon and check the validity of the first law of thermodynamics on the black brane horizon. We study thermal stability of the solutions in both canonical and grandcanonical ensemble and disclose the effects of the rotation parameter, nonlinearity of electrodynamics, and dilaton field on the thermal stability conditions. We find the solutions are thermally stable for , while for the solutions may encounter an unstable phase, where is dilatonelectromagnetic coupling constant.
A. Sheykhi, M. H. Dehghani, and M. Kord Zangeneh
Copyright © 2016 A. Sheykhi et al. All rights reserved.

A Gauged Open 2Brane String in the Brane Background
Mon, 06 Jun 2016 07:42:49 +0000
http://www.hindawi.com/journals/ahep/2016/4638596/
We make a gauge theory from the Open brane system and map it into the Open 2Brane one. Due to the presence of secondclass constraints in this model, we encounter some problems during the procedure of quantization. In this regard, considering boundary conditions as Dirac conditions, one can drive the constrained structure of the model at first. Then, with the help of BFT formalism of constraint systems, the Open 2Brane model is embedded into an extended phase space. For this purpose, we introduce some tensor fields to convert ungauged theory into the gauged one. This is the novel part of our research, while mostly scalar and vector fields are used to convert secondclass constraints into first ones.
Fahimeh Sarvi, Majid Monemzadeh, and Salman Abarghouei Nejad
Copyright © 2016 Fahimeh Sarvi et al. All rights reserved.

Combined Effect of NSI and SFP on Solar Electron Neutrino Oscillation
Sun, 05 Jun 2016 13:42:46 +0000
http://www.hindawi.com/journals/ahep/2016/1435191/
The combined effect of spinflavor precession (SFP) and the nonstandard neutrino interaction (NSI) on the survival probability of solar electron neutrinos (assumed to be Dirac particles) is examined for various values of , , and . It is found that the neutrino survival probability curves affected by SFP and NSI effects individually for some values of the parameters (, , and ) get close to the standard MSW curve when both effects are combined. Therefore, the combined effect of SFP and NSI needs to be taken into account when the solar electron neutrino data obtained by low energy solar neutrino experiments is investigated.
Deniz Yilmaz
Copyright © 2016 Deniz Yilmaz. All rights reserved.

A Universal Description of Pseudorapidity Distributions in Both NucleusNucleus and pp Collisions at Currently Available Energies
Mon, 30 May 2016 11:26:06 +0000
http://www.hindawi.com/journals/ahep/2016/5308084/
Investigations have shown that the collective motion appears not only in nucleusnucleus but also in pp collisions. The best tool for depicting such collective motion is relativistic hydrodynamics. In this paper, the collective motion is assumed to obey the hydrodynamic model which integrates the features of Landau and HwaBjorken theory and is one of a very few analytically solvable models. The fluid is then supposed to freeze out into charged particles from a spacelike hypersurface with a fixed time of . The investigations of present paper show that this part of charged particles together with leading particles, which, by conventional definition, carry on the quantum numbers of colliding nucleons and take away the most part of incident energy, can give a proper universal description to the pseudorapidity distributions of charged particles measured in both nucleusnucleus and pp collisions at currently available energies.
Z. J. Jiang, H. P. Deng, and Y. Huang
Copyright © 2016 Z. J. Jiang et al. All rights reserved.

Tryon’s Conjecture and Energy and Momentum of Bianchi Type Universes
Sun, 29 May 2016 09:02:11 +0000
http://www.hindawi.com/journals/ahep/2016/1986387/
The energy and momentum of some diagonal anisotropic Bianchi type Universes are obtained using different energymomentum complexes in the framework of General Relativity. The Møller energy is found to be zero for all the Universes considered in the present work. In all other prescriptions, the energy and momentum vanish when the sum of the metric parameters and vanishes. This result obviously raises a question: why this specific choice? We have explored Tryon’s conjecture that the Universe must have a zero net value for all conserved quantities to get some ideas on this issue.
Prajyot Kumar Mishra, Bibhudatta Panda, Pradosh Ranjan Pattanayak, and Sunil Kumar Tripathy
Copyright © 2016 Prajyot Kumar Mishra et al. All rights reserved.

Superspace Unitary Operator in Superfield Approach to NonAbelian Gauge Theory with Dirac Fields
Thu, 26 May 2016 17:15:04 +0000
http://www.hindawi.com/journals/ahep/2016/6367545/
Within the framework of augmented version of the superfield approach to BecchiRouetStoraTyutin (BRST) formalism, we derive the superspace unitary operator (and its Hermitian conjugate) in the context of four (3 + 1)dimensional (4D) interacting nonAbelian 1form gauge theory with Dirac fields. The ordinary 4D nonAbelian theory, defined on the flat 4D Minkowski spacetime manifold, is generalized onto a (4, 2)dimensional supermanifold which is parameterized by the spacetime bosonic coordinates (with ) and a pair of Grassmannian variables () which satisfy the standard relationships: and . Various consequences of the application of the above superspace (SUSP) unitary operator (and its Hermitian conjugate) are discussed. In particular, we obtain the results of the application of horizontality condition (HC) and gaugeinvariant restriction (GIR) in the language of the above SUSP operators. One of the novel results of our present investigation is the derivation of explicit expressions for the SUSP unitary operator (and its Hermitian conjugate) without imposing any Hermitian conjugation condition from outside on the parameters and (super)fields of the supersymmetric version of our 4D interacting nonAbelian 1form theory with Dirac fields.
T. Bhanja, D. Shukla, and R. P. Malik
Copyright © 2016 T. Bhanja et al. All rights reserved.

Chiral Perturbation Theory for ThreeFlavour Lattice QCD with Isospin Splitting
Wed, 18 May 2016 11:50:13 +0000
http://www.hindawi.com/journals/ahep/2016/1413648/
An important tool for the analysis of results of numerical simulations of lattice QCD is chiral perturbation theory. In the Wilson chiral perturbation theory the effects of the finite lattice spacing are taken into account. In recent years the effects of isospin splitting on the masses of hadrons have been investigated in the Monte Carlo simulations. Correspondingly, in this paper we derive the expansions of the masses of the pseudoscalar mesons in chiral perturbation theory at nexttoleading order for twisted mass lattice QCD with three light quark flavours, taking the mass difference between the up and downquarks into account. The results include terms up to orders in the quark masses, in the mass splitting between up and downquarks, and in the lattice spacing, respectively.
S. Engelnkemper and G. Münster
Copyright © 2016 S. Engelnkemper and G. Münster. All rights reserved.

The Phase Transition of Higher Dimensional Charged Black Holes
Mon, 16 May 2016 11:29:50 +0000
http://www.hindawi.com/journals/ahep/2016/7831054/
We have studied phase transitions of higher dimensional charge black hole with spherical symmetry. We calculated the local energy and local temperature and find that these state parameters satisfy the first law of thermodynamics. We analyze the critical behavior of black hole thermodynamic system by taking state parameters of black hole thermodynamic system, in accordance with considering the state parameters of van der Waals system, respectively. We obtain the critical point of black hole thermodynamic system and find that the critical point is independent of the dual independent variables we selected. This result for asymptotically flat space is consistent with that for AdS spacetime and is intrinsic property of black hole thermodynamic system.
Xiongying Guo, Huaifan Li, Lichun Zhang, and Ren Zhao
Copyright © 2016 Xiongying Guo et al. All rights reserved.

Searching for Minimum in Dependence of Squared SpeedofSound on Collision Energy
Thu, 12 May 2016 14:07:05 +0000
http://www.hindawi.com/journals/ahep/2016/9467194/
Experimental results of the rapidity distributions of negatively charged pions produced in protonproton () and berylliumberyllium (BeBe) collisions at different beam momentums, measured by the NA61/SHINE Collaboration at the super proton synchrotron (SPS), are described by a revised (threesource) Landau hydrodynamic model. The squared speedofsound parameter is then extracted from the width of rapidity distribution. There is a local minimum (knee point) which indicates a softest point in the equation of state (EoS) appearing at about GeV/ (or 8.8 GeV) in excitation function (the dependence of on incident beam momentum (or centerofmass energy)). This knee point should be related to the searching for the onset of quark deconfinement and the critical point of quarkgluon plasma (QGP) phase transition.
FuHu Liu, LiNa Gao, and Roy A. Lacey
Copyright © 2016 FuHu Liu et al. All rights reserved.

Aspects of Screening and Confinement in a Topologically Massive ChernSimonsHiggs Theory
Thu, 12 May 2016 10:33:36 +0000
http://www.hindawi.com/journals/ahep/2016/6043548/
By using the gaugeinvariant but pathdependent variables formalism, we consider a recently proposed topologically massive ChernSimonsHiggs theory in dimensions. In particular, we inspect the impact of a ChernSimons mixing term between two Abelian gauge fields on physical observables. We pursue our investigation by analyzing the model in two different situations. In the first case, where we integrate the massive excitation and consider an effective model for the massless field, we show that the interaction energy contains a linear term leading to the confinement of static charge probes along with a screening contribution. In the second situation, where the massless field can be exactly integrated with its constraint duly taken into account, the interesting feature is that the resulting effective model describes a purely screening phase, without any trace of a confining regime.
Patricio Gaete and José A. HelayëlNeto
Copyright © 2016 Patricio Gaete and José A. HelayëlNeto. All rights reserved.

Comparative Multifractal Detrended Fluctuation Analysis of Heavy Ion Interactions at a Few GeV to a Few Hundred GeV
Tue, 10 May 2016 16:22:49 +0000
http://www.hindawi.com/journals/ahep/2016/7287803/
We have studied the multifractality of pion emission process in 16OAgBr interactions at 2.1 AGeV and 60 AGeV, 12CAgBr and 24MgAgBr interactions at 4.5 AGeV, and 32SAgBr interactions at 200 AGeV using Multifractal Detrended Fluctuation Analysis (MFDFA) method which is capable of extracting the actual multifractal property filtering out the average trend of fluctuation. The analysis reveals that the pseudorapidity distribution of the shower particles is multifractal in nature for all the interactions; that is, pion production mechanism has inbuilt multiscale selfsimilarity property. We have employed MFDFA method for randomly generated events for 32SAgBr interactions at 200 AGeV. Comparison of expt. results with those obtained from randomly generated data set reveals that the source of multifractality in our data is the presence of long range correlation. Comparing the results obtained from different interactions, it may be concluded that strength of multifractality decreases with projectile mass for the same projectile energy and for a particular projectile it increases with energy. The values of ordinary Hurst exponent suggest that there is long range correlation present in our data for all the interactions.
Gopa Bhoumik, Argha Deb, Swarnapratim Bhattacharyya, and Dipak Ghosh
Copyright © 2016 Gopa Bhoumik et al. All rights reserved.

Thermodynamical Study of FRW Universe in QuasiTopological Theory
Tue, 10 May 2016 06:46:55 +0000
http://www.hindawi.com/journals/ahep/2016/7248520/
By applying the unified first law of thermodynamics on the apparent horizon of FRW universe, we get the entropy relation for the apparent horizon in quasitopological gravity theory. Throughout the paper, the results of considering the HaywardKodama and CaiKim temperatures are also addressed. Our study shows that whenever there is no energy exchange between the various parts of cosmos, we can get an expression for the apparent horizon entropy in quasitopological gravity, which is in agreement with other attempts that followed different approaches. The effects of a mutual interaction between the various parts of cosmos on the apparent horizon entropy as well as the validity of second law of thermodynamics in quasitopological gravity are perused.
H. Moradpour and R. Dehghani
Copyright © 2016 H. Moradpour and R. Dehghani. All rights reserved.

Magnetic Hexadecapole Transitions and NeutrinoNuclear Responses in MediumHeavy Nuclei
Mon, 09 May 2016 10:57:05 +0000
http://www.hindawi.com/journals/ahep/2016/8417598/
Neutrinonuclear responses in the form of squares of nuclear matrix elements, NMEs, are crucial for studies of neutrinoinduced processes in nuclei. In this work we investigate magnetic hexadecapole (M4) NMEs in mediumheavy nuclei. The experimentally derived NMEs, (M4), deduced from observed M4 transition halflives are compared with the singlequasiparticle (QP) NMEs, (M4), and the microscopic quasiparticlephonon model (MQPM) NMEs (M4). The experimentally derived M4 NMEs are found to be reduced by a coefficient with respect to (M4) and by with respect to (M4). The M4 NMEs are reduced a little by the quasiparticlephonon correlations of the MQPM wave functions but mainly by other nucleonic and nonnucleonic correlations which are not explicitly included in the MQPM. The found reduction rates are of the same order of magnitude as those for magnetic quadrupole transitions and GamowTeller (GT) and spindipole (SD) transitions. The impacts of the found reduction coefficients on the magnitudes of the NMEs involved in astroneutrino interactions and neutrinoless double beta decays are discussed.
Lotta Jokiniemi, Jouni Suhonen, and Hiroyasu Ejiri
Copyright © 2016 Lotta Jokiniemi et al. All rights reserved.

Corrections to the Jet Quenching Parameter
Sun, 08 May 2016 12:36:25 +0000
http://www.hindawi.com/journals/ahep/2016/9503491/
A calculation of corrections to the jet quenching parameter from AdS/CFT correspondence is presented. It is shown that these corrections will increase or decrease the jet quenching parameter depending on the coefficients of the high curvature terms.
Ziqiang Zhang, Defu Hou, Yan Wu, and Gang Chen
Copyright © 2016 Ziqiang Zhang et al. All rights reserved.

Geometric Algebra Techniques in Flux Compactifications
Wed, 27 Apr 2016 12:45:48 +0000
http://www.hindawi.com/journals/ahep/2016/7292534/
We study “constrained generalized Killing (s)pinors,” which characterize supersymmetric flux compactifications of supergravity theories. Using geometric algebra techniques, we give conceptually clear and computationally effective methods for translating supersymmetry conditions into differential and algebraic constraints on collections of differential forms. In particular, we give a synthetic description of Fierz identities, which are an important ingredient of such problems. As an application, we show how our approach can be used to efficiently treat compactification of Mtheory on eight manifolds and prove that we recover results previously obtained in the literature.
Calin Iuliu Lazaroiu, Elena Mirela Babalic, and Ioana Alexandra Coman
Copyright © 2016 Calin Iuliu Lazaroiu et al. All rights reserved.

On Dynamical NetCharge Fluctuations within a Hadron Resonance Gas Approach
Wed, 27 Apr 2016 12:21:39 +0000
http://www.hindawi.com/journals/ahep/2016/2475916/
The dynamical netcharge fluctuations () in different particle ratios , , and are calculated from the hadron resonance gas (HRG) model and compared with STAR central Au+Au collisions at GeV and NA49 central Pb+Pb collisions at GeV. The three charged particle ratios (, and ) are determined as total and average of opposite and average of the same charges. We find an excellent agreement between the HRG calculations and the experimental measurements, especially from STAR beam energy scan (BES) program, while the strange particles in the NA49 experiment at lower Super Proton Synchrotron (SPS) energies are not reproduced by the HRG approach. We conclude that the utilized HRG version seems to take into consideration various types of correlations including strong interactions through the heavy resonances and their decays especially at BES energies.
Abdel Nasser Tawfik, L. I. AbouSalem, Asmaa G. Shalaby, and M. Hanafy
Copyright © 2016 Abdel Nasser Tawfik et al. All rights reserved.

Study of Time Evolution for Approximation of TwoBody Spinless Salpeter Equation in Presence of TimeDependent Interaction
Wed, 27 Apr 2016 09:24:47 +0000
http://www.hindawi.com/journals/ahep/2016/3647392/
We approximate the twobody spinless Salpeter equation with the one which is valid in heavy quarks limit. We consider the resulting semirelativistic equation in a timedependent formulation. We use the LewisRiesenfeld dynamical invariant method and series solution to obtain the solutions of the differential equation. We have also done some calculations in order to derive the time evolution operator for the considered problem.
Hadi Sobhani and Hassan Hassanabadi
Copyright © 2016 Hadi Sobhani and Hassan Hassanabadi. All rights reserved.

An Effective Method to Accurately Calculate the Phase Space Factors for Decay
Wed, 27 Apr 2016 09:17:23 +0000
http://www.hindawi.com/journals/ahep/2016/7486712/
Accurate calculations of the electron phase space factors are necessary for reliable predictions of doublebeta decay rates and for the analysis of the associated electron angular and energy distributions. We present an effective method to calculate these phase space factors that takes into account the distorted Coulomb field of the daughter nucleus, yet it allows one to easily calculate the phase space factors with good accuracy relative to the most exact methods available in the recent literature.
Andrei Neacsu and Mihai Horoi
Copyright © 2016 Andrei Neacsu and Mihai Horoi. All rights reserved.

Study of Strange Charmed Meson Family Using HQET
Tue, 26 Apr 2016 12:34:33 +0000
http://www.hindawi.com/journals/ahep/2016/4957236/
Recently LHCb predicted spin 1 and spin 3 states and which are studied through their strong decays and are assigned to fit the and states in the charm spectroscopy. In this paper, using the heavy quark effective theory, we state that assigning as the mixing of states is rather a better justification to its observed experimental values than a pure state. We study its decay modes variation with hadronic coupling constant and the mixing angle . We appoint spin 3 state as the missing state and also study its decay channel behavior with coupling constant . To appreciate the above results, we check the variation of decay modes for their spin partners states, that is, and , with their masses and strong coupling constant, that is, and . Our calculation using HQET approach gives mixing angle of the state for to lie in the range ( radians radians). Our calculation for coupling constant values gives to lie within value range of and to be 0.40. We expect from experiments to observe this mixing angle to verify our results.
Pallavi Gupta and A. Upadhyay
Copyright © 2016 Pallavi Gupta and A. Upadhyay. All rights reserved.

Investigation of Pionic Contribution in the Lepton and Antilepton Production Cross Section in pCu and pPt Collision
Sun, 24 Apr 2016 13:54:29 +0000
http://www.hindawi.com/journals/ahep/2016/1402767/
For detailed explanation of the experimental results of lepton production cross section in hadronic collisions such as nucleonnucleon or nucleonnuclei, it is of great importance to use quarks and sea quarks distribution function inside free and bound nucleons. In this paper, the role of pion cloud inside the nucleus in the structure function of Cu and Pt nuclei and the EMC ratio of these nuclei were investigated by using harmonic oscillator model. Then, in the framework of the DrellYan process and conventional nuclear theory, GRV’s quarks distribution functions and pionic quarks distribution functions were used to calculate lepton and antilepton production cross section in pCu and pPt scattering. From the results and based on the mentioned model, by considering pionic contribution, the theoretical results are improved.
R. Rostami and F. Zolfagharpour
Copyright © 2016 R. Rostami and F. Zolfagharpour. All rights reserved.

Testing an Inflation Model with Nonminimal Derivative Coupling in the Light of Planck 2015 Data
Thu, 21 Apr 2016 09:24:27 +0000
http://www.hindawi.com/journals/ahep/2016/1252689/
We study the dynamics of a generalized inflationary model in which both the scalar field and its derivatives are coupled with the gravity. We consider a general form of the nonminimal derivative coupling in order to have a complete treatment of the model. By expanding the action up to the second order in perturbation, we study the spectrum of the primordial modes of the perturbations. Also, by expanding the action up to the third order and considering the threepoint correlation functions, the amplitude of the nonGaussianity of the primordial perturbations is studied in both equilateral and orthogonal configurations. Finally, by adopting some sort of potentials, we compare the model in hand with the Planck 2015 released observational data and obtain some constraints on the model’s parameters space. As an important result, we show that the nonminimal couplings help to make models of chaotic inflation that would otherwise be in tension with Planck data, in better agreement with the data. This model is consistent with observation at weak coupling limit.
Kourosh Nozari and Narges Rashidi
Copyright © 2016 Kourosh Nozari and Narges Rashidi. All rights reserved.

The Use of Low Temperature Detectors for Direct Measurements of the Mass of the Electron Neutrino
Thu, 21 Apr 2016 08:40:17 +0000
http://www.hindawi.com/journals/ahep/2016/9153024/
Recent years have witnessed many exciting breakthroughs in neutrino physics. The detection of neutrino oscillations has proved that neutrinos are massive particles, but the assessment of their absolute mass scale is still an outstanding challenge in today particle physics and cosmology. Since low temperature detectors were first proposed for neutrino physics experiments in 1984, there has been tremendous technical progress: today this technique offers the high energy resolution and scalability required to perform competitive experiments challenging the lowest electron neutrino masses. This paper reviews the thirtyyear effort aimed at realizing calorimetric measurements with subeV neutrino mass sensitivity using low temperature detectors.
A. Nucciotti
Copyright © 2016 A. Nucciotti. All rights reserved.