2004/07/26 by Wojciech Broniowski, Broniowski, Wojciech, Enrique Ruiz Arriola +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0407295
4 pages, 4 figures, talk presented by WB at DIS'2004, Strbske Pleso, Slovakia
arxiv created 2004/07/26 · arxiv updated 2009/12/01
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 <kT2> growing asymptotically as Q2 alpha(Q2). 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.