Leptonic probes of Alternative Left-Right Symmetric Models

TL;DR

This paper investigates constraints on an alternative left-right symmetric model using leptonic observables, focusing on lepton-flavour violation and magnetic moments, providing new bounds on the model's gauge boson masses.

Contribution

It offers a detailed analysis of leptonic constraints on the alternative left-right model, highlighting the importance of lepton-flavour-violating processes in setting bounds.

Findings

Magnetic moment contributions are below experimental values at 2σ.

Lepton-flavour-violating processes impose lower bounds on the $SU(2)_R$ gauge boson mass.

Constraints are complementary to collider bounds on $Z'$ mass.

Abstract

We explore constraints on the parameter space of the alternative left-right model originating from the leptonic sector. Our analyses focuses on both lepton-flavour-conserving observables, particularly the anomalous magnetic moment of the muon, and lepton-flavour-violating processes like $\mu \to e \gamma $ decay and $\mu-e$ conversions in nuclei. While contributions to the anomalous magnetic moment fall below the measured values at 2$\sigma$, current and future experimental sensitivities to flavour-violating branching rations of the Standard Model leptons are expected to impose lower bounds on the mass of the peculiar $SU(2)_R$ gauge boson of the model. This provides complementary constraints relative to existing limits, which are indirect and derived from collider bounds on the mass of the associated neutral gauge boson $Z^\prime$.