Lepton flavor violating decays $Z\to l_i^{\pm }{l}_j^{\mp }$ in the B-L Supersymmetric Standard Model

Abstract

Lepton flavor violation (LFV) represents a clear new physics (NP) signal beyond the standard model (SM). In this paper, we study LFV decays $Z\to l_i^{\pm }{l}_j^{\mp }$ in the B-L Supersymmetric Standard Model(B-LSSM). We calculate these processes separately in the mass eigenstate basis and the electroweak interaction basis, and the latter adopt the mass insertion approximation (MIA) method. The MIA clearly shows the effect of parameters on the LFV decays $Z\to l_i^{\pm }{l}_j^{\mp }$ in the analytic level, which provides a new way for us to analyze the LFV processes. At the same time, the corresponding constraints from the LFV decays $l_j^{-}\to l_i^{-}\gamma$ and $(g-2{)}_{\mu }$ are considered to analyze the numerical results.