New NLO Parametrizations of the Parton Distributions in Real Photons

Details New NLO Parametrizations of the Parton Distributions in Real Photons New NLO Parametrizations of the Parton Distributions in Real Photons

2005-03-25

arxiv.org/abs/hep-ph/0503259v2

Eur.Phys.J.C44:395-409,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1140/epjc/s2005-02355-1

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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