Minimal subtraction vs. physical factorisation schemes in small-x QCD

M. Ciafaloni, D. Colferai, G. P. Salam, A. M. Staśto

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We investigate the relationship of "physical" parton densities defined by k-factorisation, to those in the minimal subtraction scheme, by comparing their small-x behaviour. We first summarize recent results on the above scheme change derived from the BFKL equation at NLx level, and we then propose a simple extension to the renormalisation-group-improved (RGI) equation. In this way we are able the examine the difference between resummed gluon distributions in the Q0 and over(MS, -) schemes and also to show over(MS, -) scheme resummed results for Pg g and approximate ones for Pq g. We find that, due to the stability of the RGI approach, small-x resummation effects are not much affected by the scheme-change in the gluon channel, while they are relatively more important for the quark-gluon mixing.

Original languageEnglish (US)
Pages (from-to)320-329
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume635
Issue number5-6
DOIs
StatePublished - Apr 20 2006

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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