Elsevier

Physics Letters B

Volume 302, Issues 2–3, 25 March 1993, Pages 345-350
Physics Letters B

Study of χc2 production in photon-photon collisions

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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 γγχc2, χc2γJ/ψ, J/ψl+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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This work was supported in part by the US Department of Energy (under contracts DE-FG03-91ER40674, DE-AS03-76ER70285, DE-FG03-91ER40662, DE-AT03-87ER40327, DE-AM03-76SF00010, DE-AC03-76SF00098, DE-FG02-92ER40730, DE-FG02-92ER40715, and DE-AC03-76SF00515), and the National Science Foundation (under grants PHY91-19849 and PHY91-21416).

1

We gratefully acknowledge the efforts of the PEP staff for their dedication and productive running of the machine, and the engineers and technicians of the collaborating institutions for their efforts in the construction and maintenance of the detector.

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