CP Violation in Hyperon Decays from Supersymmetry

TL;DR

This paper explores how supersymmetry-induced flavor-changing gluonic dipole operators can cause observable CP violation in hyperon decays, potentially explaining experimental asymmetries without affecting epsilon'/epsilon.

Contribution

It demonstrates that supersymmetry can produce significant CP violation in hyperon decays through gluonic dipole operators, a novel connection not previously emphasized.

Findings

Supersymmetry can generate CP asymmetry A(Λ^0_-) of order 10^{-3}.

Models with λ = sqrt{m_d/m_s} do not affect epsilon'/epsilon.

The predicted CP violation is within current experimental sensitivity.

Abstract

It was pointed out recently that supersymmetry can generate flavor-changing gluonic dipole operators with sufficiently large coefficients to dominate the observed value of epsilon'/epsilon. We point out that the same operators contribute to direct CP violation in hyperon decay and can generate a CP violating asymmetry A(\Lambda^0_-) in the range probed by the current E871 experiment. Interestingly, models that naturally reproduce the relation lambda = sqrt{m_d/m_s} do not generate epsilon'/epsilon but could lead to an A(\Lambda^0_-) of O(10^{-3}).