Next-to-eikonal corrections in the CGC: gluon production and spin asymmetries in pA collisions
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Abstract
We present a new method to systematically include corrections to the eikonal
approximation in the background field formalism. Specifically, we calculate the subleading,
power-suppressed corrections due to the finite width of the target or the finite energy of the
projectile. Such power-suppressed corrections involve Wilson lines decorated by gradients
of the background field — thus related to the density - of the target. The method is of
generic applicability. As a first example, we study single inclusive gluon production in pA
collisions, and various related spin asymmetries, beyond the eikonal accuracy
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Altinoluk, T., Armesto, N., Beuf, G. et al. Next-to-eikonal corrections in the CGC: gluon production and spin asymmetries in pA collisions. J. High Energ. Phys. 2014, 68 (2014). https://doi.org/10.1007/JHEP07(2014)068
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https://doi.org/10.1007/JHEP07(2014)068Sponsors
This
work is supported by European Research Council grant HotLHC ERC-2011-StG-279579;
by People Programme (Marie Curie Actions) of the European Union Seventh Framework
Programme FP7/2007-2013/ under REA grant agreement no. 318921; by Ministerio de
Ciencia e Innovaci´on of Spain under projects FPA2009-11951 and FPA2011-22776, and
the Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042); by Xunta de Galicia
(GRC2013-024); and by FEDER. TA and MM thank to the CERN Theory division for their
kind hospitality where part of this project was done. MM is supported by U.S. Department
of Energy under Grant No. DE-SC0004286. MM thanks to the physics department at the
Universidade de Santiago de Compostela for the financial support at the early stages of
this work
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© 2014 The Authors. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made