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Title: Lepton flavor violating Z' explanation of the muon anomalous magnetic moment

Here, 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, ν μ, ν τ, 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.
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Cincinnati, OH (United States). Dept. of Physics
  2. Univ. of Victoria, BC (Canada). Dept. of Physics and Astronomy; Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  3. Max Planck Inst. fur Kernphysik, Heidelberg (Germany)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
Publication Date:
Report Number(s):
Journal ID: ISSN 0370-2693; KA2401012
Grant/Contract Number:
SC0012704; RO 2516/5-1; SC 0012704
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 762; Journal Issue: C; Journal ID: ISSN 0370-2693
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Natural Sciences and Engineering Research Council of Canada (NSERC); German Research Foundation (DFG)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; lepton; flavor; muon; HET; Muon anomalous magnetic moment; Light gauge boson; Lepton flavor violation
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1361265