Measurement of photonuclear jet production in ultra-peripheral Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector

ATLAS Collaboration; G Aad; E Aakvaag; B Abbott; S Abdelhameed; K Abeling; N J Abicht; H Abidi; M Aboelela; A Aboulhorma; Usha Mallik

doi:10.1103/PhysRevD.111.052006

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Measurement of photonuclear jet production in ultra-peripheral Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector

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Measurement of photonuclear jet production in ultra-peripheral Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector

ATLAS Collaboration, G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, N J Abicht, H Abidi, M Aboelela, A Aboulhorma, …

Physical Review D, Vol.111, 052006

03/19/2025

DOI: 10.1103/PhysRevD.111.052006

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Abstract

In ultra-relativistic heavy ion collisions at the LHC, each nucleus acts a sources of high-energy real photons that can scatter off the opposing nucleus in ultra-peripheral photonuclear (𝛾 + 𝐴) collisions. Hard scattering processes initiated by the photons in such collisions provide a novel method for probing nuclear parton distributions in a kinematic region not easily accessible to other measurements. ATLAS has measured production of dĳet and multi-jet final states in ultra-peripheral Pb+Pb collisions at √𝑠NN = 5.02 TeV using a data set recorded in 2018 with an integrated luminosity of 1.72 nb−1. Photonuclear final states are selected by requiring a rapidity gap in the photon direction; this selects events where one of the outgoing nuclei remains intact. Jets are reconstructed using the anti-𝑘t algorithm with radius parameter, 𝑅 = 0.4. Triple-differential cross-sections, unfolded for detector response, are measured and presented using two sets of kinematic variables. The first set consists of the total transverse momentum (𝐻T), rapidity, and mass of the jet system. The second set uses 𝐻T and particle-level nuclear and photon parton momentum fractions, 𝑥A and 𝑧𝛾 , respectively. The results are compared with leading-order (LO) perturbative QCD calculations of photonuclear jet production cross-sections, where all LO predictions using existing fits fall below the data in the shadowing region. More detailed theoretical comparisons will allow these results to strongly constrain nuclear parton distributions, and these data provide results from the LHC directly comparable to early physics results at the planned Electron-Ion Collider

Details

Title: Subtitle: Measurement of photonuclear jet production in ultra-peripheral Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector
Creators: ATLAS Collaboration
G Aad (Contributor) - Aix-Marseille Université
E Aakvaag (Contributor)
B Abbott (Contributor)
S Abdelhameed (Contributor)
K Abeling (Contributor)
N J Abicht (Contributor)
H Abidi (Contributor)
M Aboelela (Contributor)
A Aboulhorma (Contributor)
Usha Mallik (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: Physical Review D, Vol.111, 052006
DOI: 10.1103/PhysRevD.111.052006
ISSN: 2470-0010
eISSN: 2470-0029
Publisher: American Physical Society; Ithaca, New York
Language: English
Date published: 03/19/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984847992002771

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