Search for Direct CP Violation in $\Xi$ Hyperon Decay

TL;DR

This study searches for direct CP violation in $\Xi$ hyperon decay using CLEO II data, finding no evidence of CP violation and setting limits consistent with Standard Model expectations.

Contribution

First experimental search for direct CP violation in $\Xi$ hyperon decay with no observed asymmetry, constraining new physics beyond the Standard Model.

Findings

No evidence for CP violation: A = -0.057 ± 0.064 ± 0.039

Measured asymmetry parameters consistent with Standard Model

Set upper limits on CP violation in hyperon decays

Abstract

Using data collected with the CLEO II detector we have performed a search for direct CP violation in the $\Xi$ hyperon system. CP violation gives rise to an asymmetry, A, between the parity-violating angular distributions of the decay chains $\Xi^- \To \Lambda pi^-$, $\Lambda \To p \pi^-$ and $\bar{\Xi}^+ \To \bar{\Lambda} \pi^+$, $\bar{\Lambda} \To \bar{p} \pi^+$. In the Standard Model, A is expected to be in the range $10^{-4}$ to $10^{-5}$. If CP violation were found at a higher level it could indicate the presence of new physics. We find no evidence for CP violation: A = -0.057 +- 0.064 +- 0.039. We also obtain $A_{\Xi} = -0.070 +- 0.064 +- 0.045$ and $\alpha_{\bar{\Xi}}= 0.49^{+0.06}_{-0.05} +- 0.10$.