Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-11-21
Nucl.Phys.B599:383-423,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
40 pages, 15 figures. Final version, to be published in Nucl. Phys. B. Typos corrected in eq. 4.5 and eq. 4.20 and in caption
Scientific paper
10.1016/S0550-3213(01)00023-2
We apply our systematic NLO small x resummation of singlet splitting functions to the scaling violations of structure functions and compare the results with data. We develop various theoretical tools which are needed in order to relate resummed parton distributions to measurable structure functions, and we present results from a variety of fits to HERA data for the structure functions F_2 and F_L using the resummation. The behaviour of the singlet splitting functions at small x and fixed Q^2 is effectively parametrized as x^{-lambda}. We find that, for lambda small or negative, the resummed description of scaling violations may be phenomenologically as good as or even better than the standard next-to-leading order treatment. However, the best fit gluon density and value of alpha_s can be significantly modified by the resummation.
Altarelli Guido
Ball Richard D.
Forte Stefano
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