Search for Direct CP Violation in Non-Leptonic Decays of Charged $\Xi$ and $\Lambda$ Hyperons

TL;DR

This study searched for direct CP violation in non-leptonic decays of charged hyperons, specifically in the $ ext{Xi}$ and $ extLambda$ decay sequences, and found no evidence of such violation within measurement uncertainties.

Contribution

The paper provides the first precise measurement of the asymmetry parameter $A_{ extLambda extXi}$ in charged hyperon decays, setting limits on direct CP violation in these processes.

Findings

Measured $A_{ extLambda extXi} = 0.012 \, extpm \, 0.014$

No evidence of direct CP violation was observed

Results constrain models predicting CP violation in hyperon decays

Abstract

A search for direct CP violation in the non-leptonic decays of hyperons has been performed. In comparing the product of the decay parameters, $\alpha_{\Xi}\alpha_{\Lambda}$, in terms of an asymmetry parameter, $A_{\Xi\Lambda}$, between hyperons and anti-hyperons in the charged $\Xi \to \Lambda \pi$ and $\Lambda \to p \pi$ decay sequence, we found no evidence of direct CP violations. The parameter $A_{\Xi\Lambda}$ was measured to be $0.012 \pm 0.014$.