Fits to data on polarised structure functions and spin asymmetries with power law corrections

Details Fits to data on polarised structure functions and spin asymmetries with power law corrections Fits to data on polarised structure functions and spin asymmetries with power law corrections

2003-07-30

arxiv.org/abs/hep-ph/0307374v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, LATEX, small corrections in Tables, values of parameters with errors added

Scientific paper

We have compared polarized parton densities determined in the NLO QCD fits to polarized structure functions and spin asymmetries. We consider models of such distributions based on MRST 99 and MRST 2001 fits to non-polarized data. Simple power law corrections corresponding to higher twists are taken into account and their importance is analyzed. The role of positivity conditions for parton densities and their influence on the values of $\chi^{2}$ is discussed.

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