2018-08-08  P7F

Muon g-2 and rare top decays in variant axion models

Po-Yan Tseng

The variant axion models (VAM) offer a solution for the strong CP problem without the domain wall issue. We consider the up-specific VAM and examine their compatibility with the muon g-2 anomaly and constraints from lepton universality, flavor observables, and top quark measurements. We find the preferred parameter space requires light pseudo-scalar (A) about 15 GeV and tan β~40. Moreover, we find non-zero mixing angle among the right-handed up-quarks has no conflict with any observables, as long as this mixing angle is smaller than 0.06. This gives rise to sizable top flavor changing decay, t → uA or cA, and become a smoking gun signal at LHC.