Direct CP violation in K->3pi decays induced by SUSY chromomagnetic penguins

TL;DR

This paper investigates CP violation in K to 3pi decays, showing that supersymmetric models can enhance the asymmetry to observable levels within certain parameter ranges.

Contribution

It provides a detailed analysis of CP asymmetry in K decays within the Standard Model and supersymmetric extensions using the mass insertion approximation.

Findings

Standard Model predicts asymmetry around 10^{-5}

Supersymmetric models can produce asymmetries up to 10^{-4}

Large effects require specific parameter conditions

Abstract

An analysis of the CP violating asymmetry in $K^\pm \to (3\pi)^\pm$ decays in the Standard Model and, by means of the mass insertion approximation, in a wide class of possible supersymmetric extensions, is presented. We find that the natural order of magnitude for this asymmetry is $\cO(10^{-5})$ in both cases. Within supersymmetric models effects as large as $\cO(10^{-4})$ are possible, but only in a restricted range of the relevant parameters.