1995/05/04 by E. Laenen, S. Riemersma
Physics and Astronomy · #hep-ph
published as Z.Phys. C75 (1997) 539-554 · 7 pages Latex, with 2 eps figs., uuencoded
arxiv created 1995/05/04 · arxiv updated 2009/11/30
We discuss the calculation of F2γ(\rm charm) to next-to-leading order (NLO) in QCD, including contributions from both hadronlike and pointlike photons. We show that the former dominates strongly below x≃ 0.01, and the latter above this value. This fact makes F2γ(\rm charm) for x ≥ 0.01 calculable, whereas for x ≤ 0.01 it serves to constrain the small-x gluon density in the photon. Both ranges in x are accessible at LEP2. Theoretical uncertainties are well under control. We present rates for single-tag events for the process for e+e- → e+e- c X for LEP2. Although these event rates are small, we believe a measurement of F2γ(\rm charm) is feasible.