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Photons as Probes of Gluon Saturation in Dilute + Dense Collisions

1
Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
2
Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
3
Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
4
Physics Department, Brookhaven National Laboratory, Bldg. 510A, Upton, NY 11973, USA
*
Author to whom correspondence should be addressed.
Presented at Hot Quarks 2018—Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus-Nucleus Collisions, Texel, The Netherlands, 7–14 September 2018.
Proceedings 2019, 10(1), 33; https://doi.org/10.3390/proceedings2019010033
Published: 18 April 2019
PDF [267 KB, uploaded 18 April 2019]

Abstract

We use the Color Glass Condensate (CGC) effective field theory (EFT) to calculate inclusive photon production to leading order q g q γ , (LO), and next-to leading order g g q q ¯ γ (NLO) at LHC energies. These processes dominate the photon production at small-x , where x 0 . 01 in the target and projectile protons. We show that the NLO contribution dominates at values of x typical at the LHC, since its cross-section is sensitive to the gluon distributions in both protons. We perform a comparison of our results to the available inclusive photon data, from ATLAS and CMS at center-of-mass energies of 2 . 76 and 7 TeV . This data lies in the range k > 20 GeV . We show that for this range, the k -factorized cross-section converges to the full CGC EFT result, and can be used for the comparison. We find that it gives good agreement with experimental results. Our results are to be considered as a first step towards constraining unintegrated gluon distributions, which will be continued for larger systems, where coherent scatterings are enhanced.
Keywords: prompt; inclusive; photon; saturation; color glass condensate prompt; inclusive; photon; saturation; color glass condensate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Benić, S.; Fukushima, K.; Garcia-Montero, O.; Venugopalan, R. Photons as Probes of Gluon Saturation in Dilute + Dense Collisions. Proceedings 2019, 10, 33.

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