Measurements of the Two-Photon Widths of the Charmonium States ${\eta_c}$, $\chi_{c{\large{0}}}$ and $\chi_{c{\large{2}}}$

TL;DR

This paper reports measurements of the two-photon widths of charmonium states ta_c, hi_{c0}, and hi_{c2} using data from the CLEO-II detector, providing new insights into their production in two-photon collisions.

Contribution

First measurements of the two-photon widths of ta_c, hi_{c0}, and hi_{c2} charmonium states using the CLEO-II detector at CESR.

Findings

Measured cross sections for ta_c, hi_{c0}, hi_{c2} production.

Determined two-photon widths for these charmonium states.

Provided experimental data for testing QCD predictions.

Abstract

Using the CLEO-II detector at the CESR $e^+e^-$ storage ring running at the center-of-mass energy around 10.6 GeV, we have studied exclusive production of charmonium states in two-photon collisions. Employing a dataset comprising 3.0 ${\rm fb}^{-1}$ we have searched for decays of the $\eta_c$, $\chi_{c0}$ and $\chi_{c2}$ mesons resulting in four charged hadrons. We report on the measurements of the cross sections and two-photon widths of these charmonium states.