Twist expansion of Drell-Yan structure functions in color dipole approach

doi:10.1007/JHEP05(2015)087

Twist expansion of Drell-Yan structure functions in color dipole approach

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Twist expansion of Drell-Yan structure functions in color dipole approach

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punktacja MEiN [2015 A]: 40

title:	Twist expansion of Drell-Yan structure functions in color dipole approach
author:	Motyka Leszek , Sadzikowski Mariusz , Stebel Tomasz
journal title:	The Journal of High Energy Physics
volume:	2015
issue:	5
date of publication :	2015
article ID:	87
ISSN:	1126-6708
eISSN:	1029-8479 1127-2236
DOI:	10.1007/JHEP05(2015)087
language:	English
journal language:	English
abstract in English:	The forward Drell-Yan process at the LHC probes the proton structure at a very small Bjorken-x and moderate hard scales. In this kinematical domain higher twist effects may be significant and introduce sizeable corrections to the standard leading twist description. We study the forward Drell-Yan process beyond the leading twist approximation within the color dipole model framework that incorporates multiple scattering effects. We derive the Mellin representation of the forward Drell-Yan impact factors for fully differential cross-sections. These results combined with the color dipole cross-section of the saturation model are used to perform the twist expansion of the Drell-Yan structure functions at arbitrary transverse momentum q T of the Drell-Yan pair and also of the structure functions integrated over q_{T}. We also investigate the Lam-Tung relation, find that it is broken at twist 4 and provide explicit estimates for the breaking term.
keywords in English:	higher twist effects, phenomenological models, QCD
number of pulisher's sheets:	1,5
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper