Does Leading ln x Resummation Predict the Rise of g_1 at Small x ?

Details Does Leading ln x Resummation Predict the Rise of g_1 at Small x ? Does Leading ln x Resummation Predict the Rise of g_1 at Small x ?

1997-01-24

arxiv.org/abs/hep-ph/9701365v1

Z.Phys. C74 (1997) 631-639

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages,8 eps figures,LaTeX

Scientific paper

We numerically analyse the evolution of the flavor non-singlet $g_{1}$ structure function taking into account the all-order resummation of $\alpha_{s} ln^{2}x$ terms which is expected to have much stronger effects than the DGLAP evolution in the small x region. We include a part of the next-to-leading logarithmic corrections coming from the resummed ``coefficient function'' which are not considered in the calculation of Bl\"umlein and Vogt to respect the factorization scheme independence. It is pointed out that the resummed coefficient function gives unexpectedly large suppression factor over the experimentally accessible range of x and Q^{2}. This fact implies that the next-to-leading logarithmic contributions are very important for the $g_{1}$ structure function.

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