χc2 formation in two-photon collisions at LEP

Two-photon formation of the charmonium resonance χc2 has been studied with the L3 detector at LEP. The χc2 is identified through its decay χc2→γJ/ψ, with a subsequent decay J/ψ→e+e− or J/ψ→μ+μ−. With an integrated luminosity of 140 pb−1 at s≃ 91 GeV and 52 pb−1 at s≃ 183 GeV, we measure the two-photon width of the χc2 to be Γγγ(χc2)=1.02±0.40(stat.)±0.15(sys.)±0.09(BR.)keV.