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Journal Article

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


Dev,  Bhupal
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Altmannshofer, W., Chen, C.-Y., Dev, B., & Soni, A. (2016). Lepton flavor violating Z' explanation of the muon anomalous magnetic moment. Physics Letters B, 762, 389-398. doi:10.1016/j.physletb.2016.09.046.

Cite as: https://hdl.handle.net/21.11116/0000-0003-3E10-6
We discuss a minimal solution to the long-standing $(g-2)_\mu$ 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. $\mu, \tau, \nu_\mu, \nu_\tau$ 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 $(g-2)_\mu$-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.