Lepton flavor violating Z’ explanation of the muon anomalous magnetic moment
Date
2016
Authors
Altmannshofer, Wolfgang
Chen, Chien-Yi
Bhupal Dev, P.S.
Soni, Amarjit
Journal Title
Journal ISSN
Volume Title
Publisher
Physics Letters B
Abstract
We discuss a minimal solution to the long-standing (g−2)μ anomaly in a simple extension of the Standard Model with an extra Z’ vector boson that has only flavor off-diagonal couplings to the second and third generation of leptons, i.e. μ, τ, νμ, ντ and their antiparticles. A simplified model realization, as well as various collider and low-energy constraints on this model, are discussed. We find that the (g−2)μ-favored region for a Z’ lighter than the tau lepton is totally excluded, while a heavier Z’ solution is still allowed. Some testable implications of this scenario in future experiments, such as lepton-flavor universality-violating tau decays at Belle 2, and a new four-lepton signature involving same-sign di-muons and di-taus at HL-LHC and FCC-ee, are pointed out. A characteristic resonant absorption feature in the high-energy neutrino spectrum might also be observed by neutrino telescopes like IceCube and KM3NeT.
Description
Keywords
Muon anomalous magnetic moment, Light gauge boson, Lepton flavor violation
Citation
Altmannshofer, W., Chen, C., Bhupal Dev, P.S. & Soni, A. (2016). Lepton flavor violating Z’ explanation of the muon anomalous magnetic moment. Physics Letters B, 762, 389-398. http://dx.doi.org/10.1016/j.physletb.2016.09.046