Widening the U(1)Lμ-Lτ Z′ mass range for resolving the muon g-2 anomaly

Exchanging a Z' gauge boson is a favored mechanism to solve the muon (g - 2)(mu) anomaly. Among such models the Z' from U(1)(L mu-L tau) gauge group has been extensively studied. In this model the same interaction addressing (g - 2)(mu), leads to an enhanced muon neutrino trident (MNT) process nu N-mu -> nu(mu)mu(mu) over barN constraining the Z' mass to be less than a few hundred MeV. Many other Z' models face the same problem. It has long been realized that the coupling of Z' in the model can admit ((mu) over bar gamma(mu)tau + (nu) over bar (mu)gamma L-mu nu tau) Z'(mu) interaction which does not contribute to the MNT process. It can solve (g - 2)(mu) anomaly for a much wider Z' mass range. However this new interaction induces tau -> mu(nu) over bar (mu)nu(tau) which rules out it as a solution to (g - 2)(mu) anomaly. Here we propose a mechanism by introducing type-II seesaw SU(2)(L) triplet scalars to evade constraints from all known data to allow a wide Z' mass range to solve the (g - 2)(mu) anomaly. This mechanism opens a new window for Z' physics. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).