Strong constraints on jet quenching in centrality-dependent p + Pb collisions at 5.02 TeV from ATLAS

ATLAS Collaboration

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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 p p and p + Pb collisions. In contrast, while jet quenching is observed in Pb + 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 + Pb and 3.6 pb-1 of p p collisions at 5.02 TeV. The yields of charged hadrons with pTch > 0.5 GeV near and opposite in azimuth to jets with pTjet > 30 or 60 GeV, and the ratios of these yields between p + Pb and p p collisions, IpPb , are reported. The collision centrality of p + 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 pTch > 4 GeV at all centralities. These data provide new, strong constraints that preclude almost any parton energy loss in central p + Pb collisions.

Original languageEnglish
Article number072301
Pages (from-to)072301-1-072301-21
Number of pages21
JournalPhysical Review Letters
Volume131
Issue number7
DOIs
Publication statusPublished - 18 Aug 2023
Externally publishedYes

Bibliographical note

Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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