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

Benić, Sanjin and Dumitru, Adrian (2018) Prompt photon-jet angular correlations at central rapidities in p + A collisions. Physical Review D, 97 (1). pp. 14012-18. ISSN 1550-7998

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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 → qq¯ γ in the rapidity regime where both the projectile and target lightcone 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 þ A → qγ process. For nearly back-to-back photon-jet configurations we find that it dominates over the leading-order process q þ 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 þ A → qγ and the scale where they are evaluated. Finally, we provide analytic expressions for hcos nϕi 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.

Item Type: Article
Date: 2018
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 19 Mar 2018 16:11
Last Modified: 19 Mar 2018 16:11

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