Elsevier, Physics Letters B, 1-2(514), p. 19-28, 2001
DOI: 10.1016/s0370-2693(01)00374-4
Full text: Download
Open charm production in γγ collisions is studied with data collected at e + e − centre-of-mass energies from 189 GeV to 202 GeV corresponding to a total integrated luminosity of 410 pb −1 . The charm cross section σ(γγ→cc̅X) is measured for the first time as a function of the two-photon centre-of-mass energy in the interval from 5 GeV to 70 GeV and is compared to NLO QCD calculations.