Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in p plus Pb collisions



Aad, G, Aakvaag, E, Abbott, B, Abdelhameed, S, Abeling, K, Abicht, NJ, Abidi, SH, Aboelela, M, Aboulhorma, A, Abramowicz, H
et al (show 2864 more authors) (2026) Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in p plus Pb collisions PHYSICS LETTERS B, 877. 140440-. ISSN 0370-2693, 1873-2445

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Abstract

This Letter analyzes the sensitivity of event geometry estimators to the initial-state kinematics of hard scattering in proton–lead collisions. This analysis uses dijets as a proxy for the parton–parton scattering configuration, correlating it with event geometry estimators, namely the energy deposited in the Zero-Degree Calorimeter and the transverse energy recorded in the Forward Calorimeter in the Pb-going direction. The analysis uses data recorded by the ATLAS detector at the Large Hadron Collider with a nucleon–nucleon center-of-mass energy of 8.16 TeV, corresponding to an integrated luminosity of 56 nb−1. The jets are measured within the pseudorapidity interval −2.8 ' η ' 4.5, where positive η values correspond to the direction of the proton beam. Results are presented as a function of the Bjorken- x of the parton originating from the proton, x<inf>p</inf> . Both event geometry estimators are found to be dependent on x<inf>p</inf> , with the energy deposited in the Zero-Degree Calorimeter about six times less sensitive to x<inf>p</inf> compared with the transverse energy deposited in the Forward Calorimeter.

Item Type: Article
Uncontrolled Keywords: Dijet, Heavy ion collisions, Event geometry estimators, Color fluctuations, Nuclear breakup
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Depositing User: Symplectic Admin
Date Deposited: 15 Jun 2026 14:08
Last Modified: 15 Jun 2026 17:09
DOI: 10.1016/j.physletb.2026.140440
Open Access URL: https://www.sciencedirect.com/science/article/pii/...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3198934
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