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

Acharya, S ; Adolfsson, Jonatan LU ; Christiansen, Peter LU ; Nassirpour, Adrian LU orcid ; Oskarsson, Anders LU ; Richert, Tuva LU ; Vazquez Rueda, Omar LU ; Silvermyr, David LU orcid ; Stenlund, Evert LU and Zurlo, N (2019) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 796. p.204-219
Abstract
The jet radial structure and particle transverse momentum (pT) composition within jets are presented in centrality-selected Pb–Pb collisions at sNN=2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R=0.3 at midrapidity |ηch jet|<0.6 for transverse momenta pT,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 pT,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-pT associate particles... (More)
The jet radial structure and particle transverse momentum (pT) composition within jets are presented in centrality-selected Pb–Pb collisions at sNN=2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R=0.3 at midrapidity |ηch jet|<0.6 for transverse momenta pT,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 pT,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-pT associate particles (4<pT,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-pT associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low-pT associate particles tend to be broadened. The results, which are presented for the first time down to pT,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 pT, and add further support for the established picture of in-medium parton energy loss. © 2019 The Author(s) (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
796
pages
16 pages
publisher
Elsevier
external identifiers
  • scopus:85069829100
ISSN
0370-2693
DOI
10.1016/j.physletb.2019.07.020
language
English
LU publication?
yes
id
9e8d077b-c023-4f22-9aba-8f55c2b0396f
date added to LUP
2019-09-16 12:59:42
date last changed
2023-04-09 23:42:45
@article{9e8d077b-c023-4f22-9aba-8f55c2b0396f,
  abstract     = {{The jet radial structure and particle transverse momentum (pT) composition within jets are presented in centrality-selected Pb–Pb collisions at sNN=2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R=0.3 at midrapidity |ηch jet|&lt;0.6 for transverse momenta pT,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 pT,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-pT associate particles (4&lt;pT,assoc&lt;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-pT associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low-pT associate particles tend to be broadened. The results, which are presented for the first time down to pT,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 pT, and add further support for the established picture of in-medium parton energy loss. © 2019 The Author(s)}},
  author       = {{Acharya, S and Adolfsson, Jonatan and Christiansen, Peter and Nassirpour, Adrian and Oskarsson, Anders and Richert, Tuva and Vazquez Rueda, Omar and Silvermyr, David and Stenlund, Evert and Zurlo, N}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  pages        = {{204--219}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Measurement of jet radial profiles in Pb–Pb collisions at sNN=2.76 TeV}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2019.07.020}},
  doi          = {{10.1016/j.physletb.2019.07.020}},
  volume       = {{796}},
  year         = {{2019}},
}