Neutrinoless Double Beta Decay: 2015 Review

Table 1

List of the matter particles in the SM. The label “singlet” is often replaced with “right” and likewise for “doublet” it can become “left.” Hypercharge is assigned according to . The chirality of a field (and all its numbers) can be exchanged by considering the charge conjugate field; for example, has electric charge +1 and leptonic charge −1.

Name	Field symbol	SU multiplicity	SU multiplicity	charge	Lepton number	Baryon number
Quark doublet		3	2	+1/6	0	1/3
Singlet up quark		3	1	+2/3	0	1/3
Singlet down quark		3	1	−1/3	0	1/3
Lepton doublet		1	2	−1/2	1	0
Singlet charged lepton		1	1	−1	1	0