Constraining unintegrated gluon distributions from inclusive photon production in proton–proton collisions at the LHC
Abstract
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 kγ⟂-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.
- Authors:
-
- Kyoto Univ., Kyoto (Japan); Univ. of Zagreb, Zagreb (Croatia)
- The Univ. of Tokyo, Tokyo (Japan)
- Univ. Heidelberg, Heidelberg (Germany)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1507120
- Report Number(s):
- BNL-211546-2019-JAAM
Journal ID: ISSN 0370-2693
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics Letters. B
- Additional Journal Information:
- Journal Volume: 791; Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Benić, Sanjin, Fukushima, Kenji, Garcia-Montero, Oscar, and Venugopalan, Raju. Constraining unintegrated gluon distributions from inclusive photon production in proton–proton collisions at the LHC. United States: N. p., 2019.
Web. doi:10.1016/j.physletb.2019.02.007.
Benić, Sanjin, Fukushima, Kenji, Garcia-Montero, Oscar, & Venugopalan, Raju. Constraining unintegrated gluon distributions from inclusive photon production in proton–proton collisions at the LHC. United States. https://doi.org/10.1016/j.physletb.2019.02.007
Benić, Sanjin, Fukushima, Kenji, Garcia-Montero, Oscar, and Venugopalan, Raju. Tue .
"Constraining unintegrated gluon distributions from inclusive photon production in proton–proton collisions at the LHC". United States. https://doi.org/10.1016/j.physletb.2019.02.007. https://www.osti.gov/servlets/purl/1507120.
@article{osti_1507120,
title = {Constraining unintegrated gluon distributions from inclusive photon production in proton–proton collisions at the LHC},
author = {Benić, Sanjin and Fukushima, Kenji and Garcia-Montero, Oscar and Venugopalan, Raju},
abstractNote = {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 kγ⟂-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.},
doi = {10.1016/j.physletb.2019.02.007},
journal = {Physics Letters. B},
number = C,
volume = 791,
place = {United States},
year = {Tue Feb 12 00:00:00 EST 2019},
month = {Tue Feb 12 00:00:00 EST 2019}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 16 works
Citation information provided by
Web of Science
Web of Science
Figures / Tables:
Figure 1: Ratios of the k⊥-factorized results to the full CGC results as a function of kγ⊥ at √ s = 7 TeV with the isolation cut R = 0.4. The upper panel is for the photon rapidity ηγ = 0 and the lower for ηγ = 2.5. The bandmore »
All figures and tables
(5 total)
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
The Color Glass Condensate
journal, November 2010
- Gelis, Francois; Iancu, Edmond; Jalilian-Marian, Jamal
- Annual Review of Nuclear and Particle Science, Vol. 60, Issue 1
Bremsstrahlung of a quark propagating through a nucleus
journal, March 1999
- Kopeliovich, Boris Z.; Schäfer, Andreas; Tarasov, Alexander V.
- Physical Review C, Vol. 59, Issue 3
Photon production in high energy proton-nucleus collisions
journal, July 2002
- Gelis, François; Jalilian-Marian, Jamal
- Physical Review D, Vol. 66, Issue 1
Saturation and shadowing in high-energy proton–nucleus dilepton production
journal, September 2004
- Baier, R.; Mueller, A. H.; Schiff, D.
- Nuclear Physics A, Vol. 741
Direct photons and dileptons via color dipoles
journal, September 2007
- Kopeliovich, B. Z.; Rezaeian, A. H.; Pirner, H. J.
- Physics Letters B, Vol. 653, Issue 2-4
Direct photons at forward rapidities in high-energy pp collisions
journal, May 2009
- Kopeliovich, B. Z.; Levin, E.; Rezaeian, A. H.
- Physics Letters B, Vol. 675, Issue 2
Hadrons and direct photon production in and collisions at the LHC and saturation effects
journal, June 2010
- Rezaeian, Amir H.; Schäfer, Andreas
- Physical Review D, Vol. 81, Issue 11
Photon + hadron production in high energy deuteron (proton)–nucleus collisions
journal, May 2006
- Jalilian-Marian, Jamal
- Nuclear Physics A, Vol. 770, Issue 3-4
Prompt photon production and photon-hadron correlations at RHIC and the LHC from the color glass condensate
journal, August 2012
- Jalilian-Marian, Jamal; Rezaeian, Amir H.
- Physical Review D, Vol. 86, Issue 3
Semi-inclusive photon-hadron production in and collisions at RHIC and LHC
journal, November 2012
- Rezaeian, Amir H.
- Physical Review D, Vol. 86, Issue 9
Inclusive hadron and photon production at the LHC in dipole momentum space
journal, April 2013
- Basso, E. A. F.; Gay Ducati, M. B.; de Oliveira, E. G.
- Physical Review D, Vol. 87, Issue 7
Photon from the annihilation process with CGC in the pA collision
journal, February 2017
- Benić, Sanjin; Fukushima, Kenji
- Nuclear Physics A, Vol. 958
High energy pA collisions in the color glass condensate approach I: gluon production and the Cronin effect
journal, October 2004
- Blaizot, Jean-Paul; Gelis, François; Venugopalan, Raju
- Nuclear Physics A, Vol. 743, Issue 1-3
High energy pA collisions in the color glass condensate approach II: quark pair production
journal, October 2004
- Blaizot, Jean-Paul; Gelis, François; Venugopalan, Raju
- Nuclear Physics A, Vol. 743, Issue 1-3
Comprehensive Description of Production in Proton-Proton Collisions at Collider Energies
journal, November 2014
- Ma, Yan-Qing; Venugopalan, Raju
- Physical Review Letters, Vol. 113, Issue 19
Universal suppression of heavy quarkonium production in collisions at low transverse momentum
journal, February 2014
- Qiu, Jian-Wei; Sun, Peng; Xiao, Bo-Wen
- Physical Review D, Vol. 89, Issue 3
versus suppression in proton-nucleus collisions from factorization violating soft color exchanges
journal, January 2018
- Ma, Yan-Qing; Venugopalan, Raju; Watanabe, Kazuhiro
- Physical Review C, Vol. 97, Issue 1
Measurement of isolated photon production in pp and PbPb collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></mml:math>
journal, April 2012
- Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.
- Physics Letters B, Vol. 710, Issue 2
Measurement of the inclusive isolated prompt photon cross section in collisions at with the ATLAS detector
journal, March 2011
- Aad, G.; Abbott, B.; Abdallah, J.
- Physical Review D, Vol. 83, Issue 5
LHC forward physics
journal, October 2016
- Akiba, K.; Akbiyik, M.; Albrow, M.
- Journal of Physics G: Nuclear and Particle Physics, Vol. 43, Issue 11
Isolated photons in perturbative QCD
journal, June 1998
- Frixione, Stefano
- Physics Letters B, Vol. 429, Issue 3-4
Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton
journal, July 2010
- Ichou, Raphaëlle; d’Enterria, David
- Physical Review D, Vol. 82, Issue 1
Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data
journal, July 2012
- dʼEnterria, David; Rojo, Juan
- Nuclear Physics B, Vol. 860, Issue 3
Operator expansion for high-energy scattering
journal, March 1996
- Balitsky, I.
- Nuclear Physics B, Vol. 463, Issue 1
Small- x structure function of a nucleus including multiple Pomeron exchanges
journal, June 1999
- Kovchegov, Yuri V.
- Physical Review D, Vol. 60, Issue 3
The BFKL equation from the Wilson renormalization group
journal, October 1997
- Jalilian-Marian, Jamal; Kovner, Alex; Leonidov, Andrei
- Nuclear Physics B, Vol. 504, Issue 1-2
Nonlinear gluon evolution in the color glass condensate: I
journal, September 2001
- Iancu, Edmond; Leonidov, Andrei; McLerran, Larry
- Nuclear Physics A, Vol. 692, Issue 3-4
The renormalization group equation for the color glass condensate
journal, June 2001
- Iancu, Edmond; Leonidov, Andrei; McLerran, Larry
- Physics Letters B, Vol. 510, Issue 1-4
Long range two-particle rapidity correlations in collisions from high energy QCD evolution
journal, May 2010
- Dusling, Kevin; Gelis, François; Lappi, Tuomas
- Nuclear Physics A, Vol. 836, Issue 1-2
Analysis of combined HERA data in the impact-parameter dependent saturation model
journal, February 2013
- Rezaeian, Amir H.; Siddikov, Marat; Van de Klundert, Merijn
- Physical Review D, Vol. 87, Issue 3
Quantitative Study of the Violation of Factorization in Hadroproduction of Quarks at Collider Energies
journal, October 2005
- Fujii, Hirotsugu; Gelis, François; Venugopalan, Raju
- Physical Review Letters, Vol. 95, Issue 16
Quark pair production in high energy pA collisions: General features
journal, December 2006
- Fujii, Hirotsugu; Gelis, François; Venugopalan, Raju
- Nuclear Physics A, Vol. 780, Issue 3-4
Parton distributions with small-x resummation: evidence for BFKL dynamics in HERA data
journal, April 2018
- Ball, Richard D.; Bertone, Valerio; Bonvini, Marco
- The European Physical Journal C, Vol. 78, Issue 4
High energy factorization and small-x heavy flavour production
journal, November 1991
- Catani, S.; Ciafaloni, M.; Hautmann, F.
- Nuclear Physics B, Vol. 366, Issue 1
AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks
journal, July 2011
- Albacete, Javier L.; Armesto, Néstor; Milhano, José Guilherme
- The European Physical Journal C, Vol. 71, Issue 7
Direct photon production and PDF fits reloaded
journal, June 2018
- Campbell, John M.; Rojo, Juan; Slade, Emma
- The European Physical Journal C, Vol. 78, Issue 6
Soft photon and two hard jets forward production in proton-nucleus collisions
journal, April 2018
- Altinoluk, Tolga; Armesto, Néstor; Kovner, Alex
- Journal of High Energy Physics, Vol. 2018, Issue 4
Azimuthal anisotropy of direct photons
journal, February 2008
- Kopeliovich, B. Z.; Pirner, H. J.; Rezaeian, A. H.
- Physical Review D, Vol. 77, Issue 3
Photon-jet ridge at RHIC and the LHC
journal, May 2016
- Rezaeian, Amir H.
- Physical Review D, Vol. 93, Issue 9
Isolated photon production in proton-nucleus collisions at forward rapidity
journal, March 2018
- Ducloué, B.; Lappi, T.; Mäntysaari, H.
- Physical Review D, Vol. 97, Issue 5
Parton distributions with small-x resummation: evidence for BFKL dynamics in HERA data
journal, April 2018
- Ball, Richard D.; Bertone, Valerio; Bonvini, Marco
- The European Physical Journal C, Vol. 78, Issue 4
Direct photons and dileptons via color dipoles
text, January 2007
- Kopeliovich, B. Z.; Rezaeian, A. H.; Pirner, H. J.
- arXiv
Direct photons at forward rapidities in high-energy pp collisions
text, January 2009
- Kopeliovich, B. Z.; Levin, E.; Rezaeian, A. H.
- arXiv
Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton
text, January 2010
- Ichou, Raphaelle; d'Enterria, David
- arXiv
Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data
text, January 2012
- d'Enterria, David; Rojo, Juan
- arXiv
The Renormalization Group Equation for the Color Glass Condensate
text, January 2001
- Iancu, E.; Leonidov, A.; McLerran, L.
- arXiv
Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.