2012/07/26 by F. Hautmann, Hautmann, F., M. Hentschinski +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.1207.6420
4 pages, 4 figures, based on a talk given at the XXI Workshop on Deep-Inelastic Scattering and Related Subjects, 11-15 April, Newport News, Virginia (2011)
arxiv created 2012/07/26 · arxiv updated 2012/07/30
Parton-shower event generators that go beyond the collinear-ordering approximation at small x have so far included only gluon and valence quark channels at transverse momentum dependent level. We describe results of recent work to include effects of the sea-quark distribution with explicit dependence on the transverse quark-momentum.This sea-quark density is then applied to the description of forward Z -production. The qq*->Z matrix element (with one off-shell quark) is calculated in an explicit gauge invariant way, making use of high energy factorization. The kT-factorized result has been implemented into the CCFM Monte-Carlo CASCADE and a numerical comparison with the qg*->Zq matrix element has been carried out.