Kwiecinski evolution of unintegrated parton distributions

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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4 pages, 4 figures, talk presented by WB at DIS'2004, Strbske Pleso, Slovakia

Scientific paper

The Kwiecinski evolution of unintegrated parton distributions (UPDs) in the transverse-coordinate space is analyzed with the help of the Mellin transform. Numerical results are presented for the unintegrated pion distributions with a simple valence-like initial condition at the low scale, which follows from chiral large-Nc quark models. The effect of spreading of UPDs in the transverse momentum with the increasing scale is confirmed, with growing asymptotically as Q^2 alpha(Q^2). Formal aspects of the equations, such as the limits of UPDs at x -> 0, x -> 1, and at low and large b, are straightforward to obtain with our method.

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