New Measurement of Exclusive Decays of the chi_c0 and chi_c2 to Two-Meson Final States

TL;DR

This paper reports the most precise measurements of chi_c0 and chi_c2 decays into various two-meson final states, providing insights into charmonium decay mechanisms.

Contribution

It provides the world's most precise branching fraction measurements for chi_cJ decays into pseudoscalar mesons and includes a search for eta eta' decays.

Findings

Precise branching fractions for chi_cJ decays into pi pi, K K, eta eta, eta' eta'

First search for chi_c decays into eta eta'

Enhanced understanding of charmonium 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_{c0} and chi_{c2} decays into two-meson final states. We present the world's most precise measurements of the chi_{cJ,(J=0,2)} -> pi^+pi^-, pi^0 pi^0, K^+K^-, K^0_S K^0_S, eta eta and eta^{prime} eta^{prime} branching fractions, and a search for chi_c decays into eta eta^{prime}. These results shed light on the mechanism of charmonium decays into pseudoscalar mesons.