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

Benić, Sanjin; Dumitru, Adrian

doi:10.1103/PhysRevD.97.014012

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

Journal Article · Wed Jan 24 00:00:00 EST 2018 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.97.014012· OSTI ID:1417931

Benić, Sanjin; Dumitru, Adrian

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.

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Research Organization:: City Univ. of New York (CUNY), NY (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-09ER41620; SC0002307

OSTI ID:: 1417931

Alternate ID(s):: OSTI ID: 1498903

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 97 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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