Leptonic CP violation in the charged sector and effective field theory approach

TL;DR

This paper discusses a systematic effective field theory approach to analyze CP violation in the charged lepton sector, aiming to identify potential new physics effects beyond the Standard Model through current experimental constraints.

Contribution

It introduces a framework for using effective field theory to interpret leptonic CP violation measurements and derives new bounds on effective operators from existing experimental data.

Findings

Current limits on lepton EDMs constrain effective coefficients.

New bounds on previously unconstrained parameters are established.

Framework facilitates future searches for new physics in leptonic CP violation.

Abstract

These proceedings introduce the main techniques and ideas for a systematic effective field theory analysis of CP violation in the charged lepton sector. This study is required because the Standard Model of particle physics predicts a very high degree of CP violation suppression in the lepton sector, and this implies that possible new physics effects can be parameterised in terms of new interactions among the Standard Model fields, in the framework of the so-called Standard Model Effective Field Theory. In analogy with previous investigations of charged lepton flavour violating observables, this document illustrates how the current limits on leptonic CP violation coming from the electric-dipole moment of the leptons can be recast into constraints on the effective coefficients defined at a given decoupling scale. Furthermore, important bounds acting on previously unconstrained parameters are discussed.