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Constraining unintegrated gluon distributions from inclusive photon production in proton-proton collisions at the LHC

We compute the leading order (LO) qg→qγ and next-to-leading order (NLO) gg→qq¯γ contributions to inclusive photon production in proton-proton (p+p) collisions at the LHC. These channels provide the dominant contribution at LO and NLO for photon transverse momenta kγ⊥ corresponding to momentum fracti...

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Bibliographic Details
Main Authors: Benić, Sanjin (Author) , García-Montero, Oscar (Author)
Format: Article (Journal)
Language:English
Published: [10 April 2019]
In: Physics letters
Year: 2019, Volume: 791, Pages: 11-16
ISSN:1873-2445
DOI:10.1016/j.physletb.2019.02.007
Online Access:Verlag, Volltext: https://doi.org/10.1016/j.physletb.2019.02.007
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S037026931930098X
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Author Notes:Sanjin Benić, Kenji Fukushima, Oscar Garcia-Montero, Raju Venugopalan

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520 |a We compute the leading order (LO) qg→qγ and next-to-leading order (NLO) gg→qq¯γ contributions to inclusive photon production in proton-proton (p+p) collisions at the LHC. These channels provide the dominant contribution at LO and NLO for photon transverse momenta kγ⊥ corresponding to momentum fractions of x≤0.01 in the colliding protons. Our computations, performed in the dilute-dense framework of the Color Glass Condensate effective field theory (CGC EFT), show that the NLO contribution dominates at small-x because it is sensitive to k⊥-dependent unintegrated gluon distributions in both of the protons. We predict a maximal 10% modification of the cross section at low kγ⊥ as a direct consequence of the violation of k⊥-factorization. The coherence effects responsible for this modification are enhanced in nuclei and can be identified from inclusive photon measurements in proton-nucleus collisions. We provide numerical results for the isolated inclusive photon cross section for kγ⊥≤20 GeV in p+p collisions that can be tested in the future at the LHC. 
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