Strong Constraints on Jet Quenching in Centrality-Dependent p + Pb Collisions at 5.02 TeV from ATLAS
Files
(Published version)
Date
2023
Authors
Aad, G.
Abbott, B.
Abbott, D.C.
Abeling, K.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Abusleme Hoffman, A.C.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Physical Review Letters, 2023; 131(7):072301-1-072301-21
Statement of Responsibility
The Atlas Collaboration ... G. Aad ... E. K. Filmer ... A. X. Y. Kong ... P. Jackson ... H. Potti ... E. X. L. Ting ... M. J. White ... et al.
Conference Name
Abstract
Jet quenching is the process of color-charged partons losing energy via interactions with quark-gluon plasma droplets created in heavy-ion collisions. The collective expansion of such droplets is well described by viscous hydrodynamics. Similar evidence of collectivity is consistently observed in smaller collision systems, including pp and p þ Pb collisions. In contrast, while jet quenching is observed in Pb þ Pb collisions, no evidence has been found in these small systems to date, raising fundamental questions about the nature of the system created in these collisions. The ATLAS experiment at the Large Hadron Collider has measured the yield of charged hadrons correlated with reconstructed jets in 0.36 nb−1 of p þ Pb and 3.6 pb−1 of pp collisions at 5.02 TeV. The yields of charged hadrons with pch T > 0.5 GeV near and opposite in azimuth to jets with pjet T > 30 or 60 GeV, and the ratios of these yields between p þ Pb and pp collisions, IpPb, are reported. The collision centrality of p þ Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The IpPb values are consistent with unity within a few percent for hadrons with pch T > 4 GeV at all centralities. These data provide new, strong constraints that preclude almost any parton energy loss in central p þ Pb collisions.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
© 2023 CERN, for the ATLAS Collaboration. 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.