Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495527 | Physics Letters B | 2016 | 10 Pages |
Abstract
We discuss a minimal solution to the long-standing (gâ2)μ anomaly in a simple extension of the Standard Model with an extra Zâ² vector boson that has only flavor off-diagonal couplings to the second and third generation of leptons, i.e. μ,Ï,νμ,Î½Ï 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 (gâ2)μ-favored region for a Zâ² lighter than the tau lepton is totally excluded, while a heavier Zâ² 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Wolfgang Altmannshofer, Chien-Yi Chen, P.S. Bhupal Dev, Amarjit Soni,