Measurement of the Hadronic Photon Structure Function F_2^gamma at LEP2
arXiv:hep-ex/0110024 · doi:10.1142/9789812777157_0001
Abstract
The hadronic structure function of the photon F_2^gamma is measured as a function of Bjorken x and of the factorisation scale Q^2 using data taken by the OPAL detector at LEP. Previous OPAL measurements of the x dependence of F_2^gamma are extended to an average Q^2 of 767 GeV^2. The Q^2 evolution of F_2^gamma is studied for average Q^2 between 11.9 and 1051 GeV^2. As predicted by QCD, the data show positive scaling violations in F_2^gamma. Several parameterisations of F_2^gamma are in agreement with the measurements whereas the quark-parton model prediction fails to describe the data.
arXiv comment4 pages, 2 figures, to appear in the proceedings of Photon 2001, Ascona, Switzerland