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Suppression of maximal linear gluon polarization in angular asymmetries

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  • Published: 27 October 2017
  • Volume 2017, article number 196, (2017)
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Suppression of maximal linear gluon polarization in angular asymmetries
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  • Daniël Boer  ORCID: orcid.org/0000-0003-0985-46621,
  • Piet J. Mulders  ORCID: orcid.org/0000-0001-7678-69172,
  • Jian Zhou3 &
  • …
  • Ya-jin Zhou3 

  • 473 Accesses

  • 30 Citations

  • 1 Altmetric

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A preprint version of the article is available at arXiv.

Abstract

We perform a phenomenological analysis of the cos 2ϕ azimuthal asymmetry in virtual photon plus jet production induced by the linear polarization of gluons in unpolarized pA collisions. Although the linearly polarized gluon distribution becomes maximal at small x, TMD evolution leads to a Sudakov suppression of the asymmetry with increasing invariant mass of the γ ∗-jet pair. Employing a small-x model input distribution, the asymmetry is found to be strongly suppressed under TMD evolution, but still remains sufficiently large to be measurable in the typical kinematical region accessible at RHIC or LHC at moderate photon virtuality, whereas it is expected to be negligible in Z/W -jet pair production at LHC. We point out the optimal kinematics for RHIC and LHC studies, in order to expedite the first experimental studies of the linearly polarized gluon distribution through this process. We further argue that this is a particularly clean process to test the k t -resummation formalism in the small-x regime.

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Authors and Affiliations

  1. Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands

    Daniël Boer

  2. Nikhef and Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, NL-1081 HV, Amsterdam, The Netherlands

    Piet J. Mulders

  3. School of physics & Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan, Shandong, 250100, China

    Jian Zhou & Ya-jin Zhou

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  1. Daniël Boer
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  2. Piet J. Mulders
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  3. Jian Zhou
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  4. Ya-jin Zhou
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Correspondence to Jian Zhou.

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ArXiv ePrint: 1702.08195

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Open Access 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.

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Boer, D., Mulders, P.J., Zhou, J. et al. Suppression of maximal linear gluon polarization in angular asymmetries. J. High Energ. Phys. 2017, 196 (2017). https://doi.org/10.1007/JHEP10(2017)196

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  • Received: 06 March 2017

  • Revised: 25 September 2017

  • Accepted: 10 October 2017

  • Published: 27 October 2017

  • DOI: https://doi.org/10.1007/JHEP10(2017)196

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Keywords

  • Perturbative QCD
  • Resummation
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