A study on the interplay between perturbative QCD and CSS/TMD formalism in SIDIS processes

M. Boglione, J. O. Gonzalez Hernandez, S. Melis, A. Prokudin

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Abstract: We study the Semi-Inclusive Deep Inelastic Scattering (SIDIS) cross section as a function of the transverse momentum, qT. In order to describe it over a wide region of qT , soft gluon resummation has to be performed. Here we will use the original Collins-Soper-Sterman (CSS) formalism; however, the same procedure would hold within the improved Transverse Momentum Dependent (TMD) framework. We study the matching between the region where fixed order perturbative QCD can successfully be applied and the region where soft gluon resummation is necessary. We find that the commonly used prescription of matching through the so-called Y-factor cannot be applied in the SIDIS kinematical configurations we examine. In particular, the non-perturbative component of the resummed cross section turns out to play a crucial role and should not be overlooked even at relatively high energies. Moreover, the perturbative expansion of the resummed cross section in the matching region is not as reliable as it is usually believed and its treatment requires special attention.

Original languageEnglish (US)
Article number95
Pages (from-to)1-22
Number of pages22
JournalJournal of High Energy Physics
Volume2015
Issue number2
DOIs
StatePublished - 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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