Lepton Dipole Moments in Supersymmetric Low-Scale Seesaw Models

TL;DR

This paper investigates how supersymmetric low-scale seesaw models affect lepton dipole moments, providing numerical estimates for the muon magnetic moment and electron EDM, with implications for experimental detection.

Contribution

It introduces a minimal supergravity framework with CP violation from soft SUSY-breaking couplings, analyzing their impact on lepton dipole moments in low-scale seesaw models.

Findings

Muon anomalous magnetic moment estimates align with experimental data.

Electron EDM contributions are very small, around 10^{-27} - 10^{-28} e cm.

Heavy neutrino and sneutrino effects are within reach of current and future experiments.

Abstract

We study the anomalous magnetic and electric dipole moments of charged leptons in supersymmetric low-scale seesaw models with right-handed neutrino superfields. We consider a minimally extended framework of minimal supergravity, by assuming that CP violation originates from complex soft SUSY-breaking bilinear and trilinear couplings associated with the right-handed sneutrino sector. We present numerical estimates of the muon anomalous magnetic moment and the electron electric dipole moment (EDM), as functions of key model parameters, such as the Majorana mass scale mN and tan(\beta). In particular, we find that the contributions of the singlet heavy neutrinos and sneutrinos to the electron EDM are naturally small in this model, of order 10^{-27} - 10^{-28} e cm, and can be probed in the present and future experiments.