Branching Fraction Measurements of psi(2S) Decay to Baryon-Antibaryon Final States

TL;DR

This paper reports precise measurements of psi(2S) decays into various baryon-antibaryon pairs, including first observations of some modes, using data from the CLEO detector.

Contribution

It provides the most accurate measurements of eight psi(2S) decay modes into baryon-antibaryon final states, including first observations of Xi^0-antiXi^0 and Sigma^+-antiSigma^+.

Findings

Most precise measurements of eight decay modes.

First observation of Xi^0-antiXi^0 and Sigma^+-antiSigma^+ modes.

Upper limits set for Xi^0*-antiXi^0* and Omega^- antiOmega^- modes.

Abstract

Using 3.08 million psi(2S) decays observed in e^+e^- collisions by the CLEO detector, we present the results of a study of the psi(2S) decaying into baryon-antibaryon final states. We report the most precise measurements of the following eight modes: proton-antiproton, lambda-antilambda, Xi^- antiXi^-, Xi^0-antiXi^0 (first observation), Sigma+-antiSigma^+ (first observation), and Sigma^0-antiSigma^0, and place upper limits for the modes, Xi^0*-antiXi^0* and Omega^- antiOmega^-.