Measurement of χ_{c2} Production in Two-Photon Collisions

Details Measurement of χ_{c2} Production in Two-Photon Collisions Measurement of χ_{c2} Production in Two-Photon Collisions

2002-05-30

arxiv.org/abs/hep-ex/0205100v1

Phys.Lett.B540:33-42,2002

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 5 figures, to be submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(02)02104-4

The production of the \chi_{c2} charmonium state in two-photon collisions has been measured with the Belle detector at the KEKB e^+e^- collider. A clear signal for \chi_{c2} --> \gamma J/\psi, J/\psi --> l^+l^- is observed in a 32.6fb^{-1} data sample accumulated at center-of-mass energies near 10.6GeV, and the product of its two-photon decay width and branching fraction is determined to be \Gamma_{\gamma\gamma}(\chi_{c2})B(\chi_{c2} --> \gamma J/\psi) B(J/\psi --> l^+l^-)= 13.5 +/- 1.3(stat.) +/- 1.1(syst.)eV.

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