New NLO Parametrizations of the Parton Distributions in Real Photons

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.

38 pages, 23 Postscript figures, fig. 6,7,8,9 improved, comparisons with other NLO parametrizations, added references

References in corpus (3)

• The Three-Loop Splitting Functions in QCD: The Non-Singlet Case
• A New 5 Flavour NLO Analysis and Parametrizations of Parton Distributions of the Real Photon
• Electroproduction Cross Section of Large_Et Hadrons at NLO and Virtual Photon Structure Function

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