χc2 formation in two-photon collisions at LEP
Abstract
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 sqrt(s)~= 91 GeV and 52 pb-1 at sqrt(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.
- Publication:
-
Physics Letters B
- Pub Date:
- April 1999
- DOI:
- 10.1016/S0370-2693(99)00279-8
- Bibcode:
- 1999PhLB..453...73L