Production of Chi_c2 Mesons in Photon-Photon Collisions at LEP
The OPAL Collaboration, K. Ackerstaff et al
TL;DR
This paper reports the first observation of chi_c2 meson production in photon-photon collisions at LEP, measuring its two-photon width with data from the OPAL detector at different energies.
Contribution
It provides the first measurement of chi_c2 meson production in photon-photon collisions at LEP energies, using the decay channel chi_c2 to J/psi gamma.
Findings
Measured two-photon width of chi_c2: 1.76 keV with uncertainties.
Observed chi_c2 production in photon-photon collisions at LEP.
Used data at 91 and 183 GeV with specific integrated luminosities.
Abstract
We present an observation at LEP of the production of chi_c2 mesons in the collisions of two quasi-real photons using the OPAL detector. The chi_c2 mesons are reconstructed in the decay channel Chi_c2 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 Chi_2 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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