Factorization model for distributions of quarks in hadrons
Abstract
We consider distributions of unpolarized (polarized) quarks in unpolarized (polarized) hadrons. Our approach is based on QCD factorization. We begin with a study of the basic factorization for the partonhadron scattering amplitudes in the forward kinematics and suggest a model for nonperturbative contributions to such amplitudes. This model is based on this simple observation: after emitting an active quark by the initial hadron, the remaining set of quarks and gluons becomes unstable, so a description of this colored state can approximately be done in terms of resonances, which leads to expressions of the BreitWigner type. Then we reduce these formulas to obtain explicit expressions for the quarkhadron scattering amplitudes and quark distributions in  and collinear factorizations.
 Publication:

European Physical Journal C
 Pub Date:
 July 2015
 DOI:
 10.1140/epjc/s1005201534839
 arXiv:
 arXiv:1503.00513
 Bibcode:
 2015EPJC...75..306E
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 18 pp, 7 figures. In the present version we include a discussion on rapidity divergences, correct some unclearly presented issues and eliminate misprints