Measurement of two-photon production of the χc2

California Institute of Technology
University of Oklahoma
San Diego University of California
Syracuse University
University of Minnesota Twin Cities
Santa Barbara University of California
Carnegie Mellon University
University of Rochester
Southern Methodist University
Lawrence University of Kansas
University of Florida
Ithaca College
Harvard University
University at Albany State University of New York
Cornell University
Purdue University
Ohio State University
Vanderbilt University
University of Colorado at Boulder
University of Illinois at Urbana-Champaign

Abstract

The CLEO II detector is used to search for the production of χc2 states in two-photon interactions. We use the signature χc2→γJ/ ψ→γl+l- with l=e,μ. Using 1.49 fb-1 of data taken with beam energies near 5.29 GeV, the two-photon width of the χc2 is determined to be Γ(χc2→γγ)=1.08±0.30(stat)±0.26(syst) keV, in agreement with predictions from perturbative QCD.