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Study of Χc2 Production in Photon-Photon Collisions

D.A. Bauer,R. Belcinski,R.C. Berg,H.H. Bingham,C.D. Buchanan,D.O. Caldwell,S-B. Chun,A.R. Clark,O.I. Dahl,M. Daoudi,J.J. Eastman,A.M. Eisner, K.H. Fairfield,G. Godfrey,G.S. Greenbaum,J.M. Hauptman,W. Hofmann,R.L. Holtzapple,S. Khacheryan,K.T. Knöpfle

Physics letters B（1993）

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Abstract
Two-photon production of the charmonium state χc has been studied by the TPC/Two-Gamma experiment at the SLAC e+e− collider PEP. We observe evidence of the χc2 state in the channel γγ→χc2, χc2→γJ/ψ, J/ψ→l+l− and obtain a value of Γγγ(χc2)=3.4±1.7±0.9 keV. This is the first observation of the two-photon production of a χc state. Comparison is made with previous experimental results and QCD predictions for Γγγ(χc2).
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