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

Znanstveni rad - Izvorni znanstveni rad

• Autor: Sanjin Benić; MBZ: 310875
• Autor: Adrian Dumitru
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

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.

• Ključne riječi (engleski): Quantum Chromodynamics; quark and gluon jets; photon
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review D
• Brojčani podaci: vol. 97, br. 1, 014012
• p-ISSN: 2470-0010
• e-ISSN: 2470-0029
• DOI: https://doi.org/10.1103/PhysRevD.97.014012
• URN:NBN: urn:nbn:hr:217:560500
• Datum objave publikacije: 2018
• Projekt: Šifra: IP-2013-11-8799; Naziv (hrvatski): Tvar i međudjelovanja na ubrzivačima i u svemiru; Kratica: MIAU; Voditelj: Krešimir Kumerički; Pravna nadležnost: Hrvatska; Financijer: HRZZ; Linija financiranja: IP
• URL dokumenta: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.014012
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2018 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/. 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.
• Datum i vrijeme pohrane: 2020-02-29 21:19:36