Lepton electric and magnetic dipole moments via lepton flavor violating spin-1 unparticle interactions

TL;DR

This paper investigates how spin-1 unparticle interactions with lepton flavor violation affect lepton magnetic and electric dipole moments, constraining models with experimental data and exploring the dominance of vector couplings.

Contribution

It introduces a novel analysis of lepton dipole moments via spin-1 unparticle LFV interactions, including CP violation, and constrains couplings using experimental limits.

Findings

Current data favors vector over axial-vector couplings.

Estimated EDMs are below experimental bounds.

Constraints on unparticle parameters are derived from muon MDM and LFV decays.

Abstract

The magnetic dipole moment (MDM) and the electric dipole moment (EDM) of leptons are calculated under the assumption of lepton flavor violation (LFV) induced by spin-1 unparticles with both vector and axial-vector couplings to leptons,including a CP-violating phase. The experimental limits on the muon MDM and LFV process such as the decay l_i->i_jl_kl_k are then used to constrain the LFV couplings for particular values of the unparticle operator dimension d_U and the unparticle scale \Lambda_U, assuming that LFV transitions between the tau and muon leptons are dominant. It is found that the current experimental constraints favor a scenario with dominance of the vector couplings over the axial-vector couplings. We also obtain estimates for the EDMs of the electron and the muon, which are well below the current experimental limits.