Exclusive Baryon-Antibaryon Decays of the chi_cJ Mesons

TL;DR

This paper reports precise measurements of chi_cJ meson decays into baryon-antibaryon pairs, including the first measurements for certain hyperon channels, shedding light on their decay mechanisms.

Contribution

It provides the most accurate branching fractions for chi_cJ decays into p-pbar and Lambda-Lambdabar, and presents first measurements for chi_c0 decays to other hyperons.

Findings

Precise branching fractions for chi_cJ -> p-pbar and Lambda-Lambdabar.

First measurements of chi_c0 decays to other hyperons.

Results enhance understanding of chi_c states decay mechanisms.

Abstract

Using a sample of 2.59 \times 10^7 psi(2S) decays collected by the CLEO--c detector, we present results of a study of chi_{cJ} (J=0,1,2) decays into baryon-antibaryon final states. We present the world's most precise measurements of the chi_cJ -> p-pbar and chi_cJ -> Lambda-Lambdabar branching fractions, and the first measurements of chi_c0 decays to other hyperons. These results illuminate the decay mechanism of the chi_c states.