Non-linear evolution in CCFM: The interplay between coherence and saturation

Emil Avsar, Anna Stasto

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We solve the CCFM equation numerically in the presence of a boundary condition which effectively incorporates the non-linear dynamics. We retain the full dependence of the unintegrated gluon distribution on the coherence scale, and extract the saturation momentum. The resulting saturation scale is a function of both rapidity and the coherence momentum. In Deep Inelastic Scattering this will lead to a dependence of the saturation scale on the photon virtuality in addition to the usual x Bj dependence. At asymptotic energies the interplay between the perturbative non-linear physics, and that of the QCD coherence, leads to an interesting and novel dynamics where the saturation momentum itself eventually saturates. We also investigate various implementations of the "non-Sudakov" form factor. It is shown that the non-linear dynamics leads to almost identical results for different form factors. Finally, different choices of the scale of the running coupling are analyzed and implications for the phenomenology are discussed.

Original languageEnglish (US)
Article number112
JournalJournal of High Energy Physics
Volume2010
Issue number6
DOIs
StatePublished - Aug 2 2010

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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