Production of Chic2 Mesons in Photon-Photon Collisions at LEP
The OPAL Collaboration, K. Ackerstaff et al
Abstract
We present an observation at LEP of the production of chic2 mesons in the collisions of two quasi-real photons using the OPAL detector. The chic2 mesons are reconstructed in the decay channel Chic2 to J/psi gamma to l+l- gamma (with l= e,mu) using all data taken at e+e- centre-of-mass energies of 91 and 183 GeV, corresponding to integrated luminosities of 167 and 55 pb-1 respectively. The two-photon width of the Chi2 is determined to be 1.76 +- 0.47 +- 0.37 +- 0.15 keV where the first error is statistical, the second is systematic and the third comes from branching ratio uncertainties.
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