1206.5757 (Krzysztof Kutak)

Resummation in nonlinear equation for high energy factorisable gluon
density and its extension to include coherence    [PDF]

Krzysztof Kutak

Motivated by forthcoming p-Pb experiments at Large Hadron Collider which require both knowledge of gluon densities accounting for saturation and for processes at a wide range of $p_t$ we study basic momentum space evolution equations of high energy limit of QCD. Solutions of those equations might be used to form a set of gluon densities to calculate observables in generalized high energy factorization. Morever in order to provide a framework for predictions for exclusive final states in p-Pb scattering with high $p_t$ we rewrite the equation for the high energy factorisable gluon density in a resummed form, similarly to what has been done in \cite{Kutak:2011fu} for the BK equation. The resummed equation is then extended to account for color coherence. This introduces an external scale to the evolution of the gluon density, and therefore makes it applicable in studies of final states.

View original: http://arxiv.org/abs/1206.5757