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Title: Prompt photon-jet angular correlations at central rapidities in p + A collisions

Abstract

Photon-jet azimuthal correlations in proton-nucleus collisions are a promising tool for gaining information on the gluon distribution of the nucleus in the regime of nonlinear color fields. We compute such correlations from the process g → $$q\overline{q}γ$$ in the rapidity regime where both the projectile and target light-cone momentum fractions are small. By integrating over the phase space of the quark which emits the photon, subject to the restriction that the photon picks up most of the transverse momentum (to pass an isolation cut), we effectively obtain a g + A → qγ process. For nearly back-to-back photon-jet configurations we find that it dominates over the leading-order process q + A → qγ by two less powers of Q /Q S , where Q and Q S denote the net photon-jet pair momentum and the saturation scale of the nucleus, respectively. We determine the transverse-momentum-dependent gluon distributions involved in g + A → qγ and the scale where they are evaluated. Finally, we provide analytic expressions for moments, where Φ is the angle between Q and the average photon-jet transverse momentum ˜P , and first qualitative estimates of their transverse momentum dependence.

Authors:
 [1];  [2]
  1. University of Zagreb (Croatia)
  2. Baruch College, CUNY, NY (United States); City Univ. (CUNY), NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
City Univ. (CUNY), NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1417931
Alternate Identifier(s):
OSTI ID: 1498903
Grant/Contract Number:  
SC0002307; FG02-09ER41620
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Benić, Sanjin, and Dumitru, Adrian. Prompt photon-jet angular correlations at central rapidities in p+A collisions. United States: N. p., 2018. Web. doi:10.1103/physrevd.97.014012.
Benić, Sanjin, & Dumitru, Adrian. Prompt photon-jet angular correlations at central rapidities in p+A collisions. United States. doi:10.1103/physrevd.97.014012.
Benić, Sanjin, and Dumitru, Adrian. Wed . "Prompt photon-jet angular correlations at central rapidities in p+A collisions". United States. doi:10.1103/physrevd.97.014012.
@article{osti_1417931,
title = {Prompt photon-jet angular correlations at central rapidities in p+A collisions},
author = {Benić, Sanjin and Dumitru, Adrian},
abstractNote = {Photon-jet azimuthal correlations in proton-nucleus collisions are a promising tool for gaining information on the gluon distribution of the nucleus in the regime of nonlinear color fields. We compute such correlations from the process g → $q\overline{q}γ$ in the rapidity regime where both the projectile and target light-cone momentum fractions are small. By integrating over the phase space of the quark which emits the photon, subject to the restriction that the photon picks up most of the transverse momentum (to pass an isolation cut), we effectively obtain a g + A → qγ process. For nearly back-to-back photon-jet configurations we find that it dominates over the leading-order process q + A → qγ by two less powers of Q⊥/QS , where Q⊥ and QS denote the net photon-jet pair momentum and the saturation scale of the nucleus, respectively. We determine the transverse-momentum-dependent gluon distributions involved in g + A → qγ and the scale where they are evaluated. Finally, we provide analytic expressions for moments, where Φ is the angle between Q⊥ and the average photon-jet transverse momentum ˜P⊥, and first qualitative estimates of their transverse momentum dependence.},
doi = {10.1103/physrevd.97.014012},
journal = {Physical Review D},
number = 1,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/physrevd.97.014012

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Cited by: 2 works
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