Cone-radius logarithm resummation restores the unitarity bound for isolated photon cross sections, and hollow-cone results become close to standard cone results.
New NLO Parametrizations of the Parton Distributions in Real Photons
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abstract
We present new NLO sets of parton distributions in real photons based on a scheme invariant definition of the non-perturbative input. We compare the theoretical predictions with LEP data and a best fit allows us to constrain the parameters of the distributions. The shape of the gluon distribution is poorly constrained and we consider the possibility to measure it in photoproduction experiments. Three parametrizations which aim to take into account the scattering of LEP data are proposed. They are compared to other NLO parametrizations.
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Isolated photon cross section and resummation of the logarithms of the cone radius
Cone-radius logarithm resummation restores the unitarity bound for isolated photon cross sections, and hollow-cone results become close to standard cone results.