Gauge $B\text{–}L$ model with residual $Z_3$ symmetry

Journal Article · 01 November 2015 · Physics Letters B

DOI: https://doi.org/10.1016/j.physletb.2015.09.010 · OSTI ID:1214243

Ma, Ernest; Pollard, Nicholas; Srivastava, Rahul; Zakeri, Mohammadreza

We study a gauge B–L extension of the standard model of quarks and leptons with unconventional charges for the singlet right-handed neutrinos, and extra singlet scalars, such that a residual Z₃ symmetry remains after the spontaneous breaking of B–L. The phenomenological consequences of this scenario, including the possibility of long-lived self-interacting dark matter and Z' collider signatures is discussed. Lepton number L is a familiar concept. It is usually defined as a global U (1) symmetry, under which the leptons of the standard model (SM), i.e. e,μ,τ together with their neutrinos ν_e,ν_μ,ν_τ have L=1, and all other SM particles have L=0. In the case of nonzero Majorana neutrino masses, this continuous symmetry is broken to a discrete Z₂ symmetry, i.e. (-1)^L or lepton parity. In this paper, we consider a gauge B–L extension of the SM, such that a residual Z₃ symmetry remains after the spontaneous breaking of B–L. This is then a realization of the unusual notion of Z₃ lepton symmetry. It has specific phenomenological consequences, including the possibility of a long-lived particle as a dark-matter candidate.

• Research Organization: Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0008541
• OSTI ID: 1214243
• Alternate ID(s): OSTI ID: 1241140
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Vol. 750 Journal Issue: C; ISSN 0370-2693
• Publisher: ElsevierCopyright Statement
• Country of Publication: Netherlands
• Language: English