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

ALICE Collaboration, S. Acharya, H.A. Andrews, D. Evans, K.L. Graham, O. Jevons, P.G. Jones, A. Jusko, M. Krivda, J. Kvapil, R. Lietava, O. Villalobos Baillie, E. Willsher, N. Zardoshti

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
139 Downloads (Pure)

Abstract

The jet radial structure and particle transverse momentum (p T) composition within jets are presented in centrality-selected Pb–Pb collisions at s NN=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 ch jet|<0.6 for transverse momenta p T,ch jet=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 T,assoc-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 T associate particles (4<p T,assoc<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 T associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low-p T associate particles tend to be broadened. The results, which are presented for the first time down to p T,ch jet=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 T, and add further support for the established picture of in-medium parton energy loss.

Original languageEnglish
Pages (from-to)204-219
Number of pages16
JournalPhysics Letters B
Volume796
Early online date12 Jul 2019
DOIs
Publication statusPublished - 10 Sep 2019

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint

Dive into the research topics of 'Measurement of jet radial profiles in Pb–Pb collisions at sNN=2.76 TeV'. Together they form a unique fingerprint.

Cite this