R-parity violating two-loop level rainbowlike contribution to the fermion electric dipole moment

TL;DR

This paper investigates a two-loop supersymmetric contribution to fermion electric dipole moments via R-parity violation, highlighting its potential significance at large tan beta and providing new experimental bounds on R-parity violating couplings.

Contribution

It introduces a novel two-loop rainbowlike contribution to fermion EDMs in R-parity violating SUSY, showing its potential to rival known Barr-Zee processes at TeV scales.

Findings

Enhanced contribution at large tan beta.

Comparable size to Barr-Zee type processes.

New upper bounds on R-parity violating couplings.

Abstract

We analyze the two-loop level $R$-parity violating supersymmetric contribution to the electric and chromoelectric dipole moments of fermions with a lepton and a gaugino in the intermediate state. It is found that this contribution can be sufficiently enhanced with large $\tan \beta$ and that it can have comparable size with the currently known $R$-parity violating Barr-Zee type process within TeV scale supersymmetry breaking. We also give new upper limits on $R$-parity violating couplings given by the atomic electric dipole moment and molecular beam experiments.