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Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS

Aad, G. ; åkesson, T.P.A. LU orcid ; Astrand, K.S.V. LU ; Doglioni, C. LU ; Ekman, P.A. LU orcid ; Hedberg, V. LU ; Herde, H. LU orcid ; Konya, B. LU ; Lytken, E. LU orcid and Poettgen, R. LU orcid , et al. (2025) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 871.
Abstract
Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions.This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of R=1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb-1 of Pb+Pb data and 255 pb-1 of pp data, both at sNN=5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering R=0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear... (More)
Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions.This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of R=1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb-1 of Pb+Pb data and 255 pb-1 of pp data, both at sNN=5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering R=0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor ( R AA). The jet R AA is measured as a function of jet p T, the charged kt splitting scale (d12), and the angular separation (? R 12) of two leading sub-jets. The jet R AA gradually decreases with increasing d12, implying significantly stronger suppression of large-radius jets with larger kt splitting scale. The jet R AA gradually decreases for ? R 12 in the range 0.01-0.2 and then remains consistent with a constant for ? R 12 ? 0.2. The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process. © 2025 The Authors. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
Jet quenching, Jets & heavy flavor physics, Quark-gluon plasma, Relativistic heavy-ion collisions
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
871
article number
139929
publisher
Elsevier
external identifiers
  • scopus:105026507214
ISSN
0370-2693
DOI
10.1016/j.physletb.2025.139929
language
English
LU publication?
yes
id
ae4d41c0-a667-4e4d-99da-f29994840d16
date added to LUP
2026-04-08 11:23:09
date last changed
2026-04-08 11:24:25
@article{ae4d41c0-a667-4e4d-99da-f29994840d16,
  abstract     = {{Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions.This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of R=1.0 and its dependence on the jet substructure. The measurement uses 1.72 nb-1 of Pb+Pb data and 255 pb-1 of pp data, both at sNN=5.02 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering R=0.2 calorimetric jets and are measured for transverse momentum above 200 GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor ( R AA). The jet R AA is measured as a function of jet p T, the charged kt splitting scale (d12), and the angular separation (? R 12) of two leading sub-jets. The jet R AA gradually decreases with increasing d12, implying significantly stronger suppression of large-radius jets with larger kt splitting scale. The jet R AA gradually decreases for ? R 12 in the range 0.01-0.2 and then remains consistent with a constant for ? R 12 ? 0.2. The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process. © 2025 The Authors.}},
  author       = {{Aad, G. and åkesson, T.P.A. and Astrand, K.S.V. and Doglioni, C. and Ekman, P.A. and Hedberg, V. and Herde, H. and Konya, B. and Lytken, E. and Poettgen, R. and Smirnova, O. and Sur, N. and Wallin, E.J. and Zwalinski, L.}},
  issn         = {{0370-2693}},
  keywords     = {{Jet quenching; Jets & heavy flavor physics; Quark-gluon plasma; Relativistic heavy-ion collisions}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2025.139929}},
  doi          = {{10.1016/j.physletb.2025.139929}},
  volume       = {{871}},
  year         = {{2025}},
}