Strong Constraints on Jet Quenching in Centrality-Dependent p+Pb Collisions at 5.02 TeV from ATLAS.

Aad, G; Abbott, B; Abbott, D C; Abeling, K; Abidi, S H; Aboulhorma, A; Abramowicz, H; Abreu, H; Abulaiti, Y; Abusleme Hoffman, A C; Acharya, B S; Achkar, B; Adam, L; Adam Bourdarios, C; Adamczyk, L; Adamek, L; Addepalli, S V; Adelman, J; Adiguzel, A; Adorni, S; ... (2023). Strong Constraints on Jet Quenching in Centrality-Dependent p+Pb Collisions at 5.02 TeV from ATLAS. Physical review letters, 131(7), 072301. American Physical Society 10.1103/PhysRevLett.131.072301

[img] Text
PhysRevLett.131.072301.pdf
Restricted to registered users only
Available under License BORIS Standard License.

Download (49MB)

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+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 pp collisions at 5.02 TeV. The yields of charged hadrons with p_{T}^{ch}>0.5  GeV near and opposite in azimuth to jets with p_{T}^{jet}>30 or 60 GeV, and the ratios of these yields between p+Pb and pp collisions, I_{pPb}, are reported. The collision centrality of p+Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The I_{pPb} values are consistent with unity within a few percent for hadrons with p_{T}^{ch}>4  GeV at all centralities. These data provide new, strong constraints that preclude almost any parton energy loss in central p+Pb collisions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
08 Faculty of Science > Physics Institute
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Anders, John Kenneth, Beck, Hans Peter, Chatterjee, Meghranjana, Ereditato, Antonio, Franconi, Laura, Halser, Lea, Haug, Sigve, Ilg, Armin, Müller, Roman, O'Neill, Aaron Paul, Weber, Manuel

Subjects:

500 Science > 530 Physics

ISSN:

1079-7114

Publisher:

American Physical Society

Language:

English

Submitter:

Pubmed Import

Date Deposited:

04 Sep 2023 12:31

Last Modified:

29 Oct 2023 02:22

Publisher DOI:

10.1103/PhysRevLett.131.072301

PubMed ID:

37656838

BORIS DOI:

10.48350/185989

URI:

https://boris.unibe.ch/id/eprint/185989

Actions (login required)

Edit item Edit item
Provide Feedback