Measurement of jet radial profiles in Pb-Pb collisions at √sNN=2.76 TeV



Acharya, S, Adamova, D, Adhya, SP, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1012 more authors) (2019) Measurement of jet radial profiles in Pb-Pb collisions at √sNN=2.76 TeV PHYSICS LETTERS B, 796. pp. 204-219. ISSN 0370-2693, 1873-2445

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Abstract

The jet radial structure and particle transverse momentum (p<inf>T</inf>) composition within jets are presented in centrality-selected Pb–Pb collisions at s<inf>NN</inf>=2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R=0.3 at midrapidity |η<inf>ch jet</inf>|<0.6 for transverse momenta p<inf>T,ch jet</inf>=30–120 GeV/c. Jet–hadron correlations in relative azimuth and pseudorapidity space (Δφ,Δη) are measured to study the distribution of the associated particles around the jet axis for different p<inf>T,assoc</inf>-ranges between 1 and 20 GeV/c. The data in Pb–Pb collisions are compared to reference distributions for pp collisions, obtained using embedded PYTHIA simulations. The number of high-p<inf>T</inf> associate particles (4<p<inf>T,assoc</inf><20 GeV/c) in Pb–Pb collisions is found to be suppressed compared to the reference by 30 to 10%, depending on centrality. The radial particle distribution relative to the jet axis shows a moderate modification in Pb–Pb collisions with respect to PYTHIA. High-p<inf>T</inf> associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low-p<inf>T</inf> associate particles tend to be broadened. The results, which are presented for the first time down to p<inf>T,ch jet</inf>=30 GeV/c in Pb–Pb collisions, are compatible with both previous jet–hadron-related measurements from the CMS Collaboration and jet shape measurements from the ALICE Collaboration at higher p<inf>T</inf>, and add further support for the established picture of in-medium parton energy loss.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 05 Dec 2019 15:21
Last Modified: 16 Jun 2026 16:02
DOI: 10.1016/j.physletb.2019.07.020
Open Access URL: https://doi.org/10.1016/j.physletb.2019.07.020
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3064990
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