Measurement of γγ widths of charmonium states

Ohio State University
Syracuse University
University of Minnesota Twin Cities
University of Rochester
University of Maryland
Lawrence University of Kansas
University of Florida
Ithaca College
University at Albany State University of New York
Harvard University
Purdue University
Cornell University
Vanderbilt University

Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have searched for two-photon production of charmonium in four-track final states. We have measured Γγγ(ηc)=5.9+2.1−1.8±1.9 keV, and we have obtained 95% CL upper limits of Γγγ(Xc0)Γγγ(Xc2)