Prompt photon-jet angular correlations at central rapidities in 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⊥/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.
- Authors:
- Publication Date:
- Research Org.:
- City Univ. of New York (CUNY), NY (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1417931
- Alternate Identifier(s):
- OSTI ID: 1498903
- Grant/Contract Number:
- FG02-09ER41620; SC0002307
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Name: Physical Review. D. Journal Volume: 97 Journal Issue: 1; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society
- 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. https://doi.org/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. https://doi.org/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 = {Wed Jan 24 00:00:00 EST 2018},
month = {Wed Jan 24 00:00:00 EST 2018}
}
https://doi.org/10.1103/PhysRevD.97.014012
Web of Science
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