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Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector

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 European Physical Journal C 85(4).
Abstract
The Lund jet plane (LJP) is measured for the first time in tt¯ events, using 140 fb-1 of s=13 TeV pp collision data collected with the ATLAS detector at the LHC. The LJP is a two-dimensional observable of the sub-structure of hadronic jets that acts as a proxy for the kinematics of parton showers and hadron formation. The observable is constructed from charged particles and is measured for R=1.0 anti-kt jets with transverse momentum above 350 GeV containing the full decay products of either a top quark or a daughter W boson. The other top quark in the event is identified from its decay into a b-quark, an electron or a muon and a neutrino. The measurement is corrected for detector effects and compared with a range of Monte Carlo predictions... (More)
The Lund jet plane (LJP) is measured for the first time in tt¯ events, using 140 fb-1 of s=13 TeV pp collision data collected with the ATLAS detector at the LHC. The LJP is a two-dimensional observable of the sub-structure of hadronic jets that acts as a proxy for the kinematics of parton showers and hadron formation. The observable is constructed from charged particles and is measured for R=1.0 anti-kt jets with transverse momentum above 350 GeV containing the full decay products of either a top quark or a daughter W boson. The other top quark in the event is identified from its decay into a b-quark, an electron or a muon and a neutrino. The measurement is corrected for detector effects and compared with a range of Monte Carlo predictions sensitive to different aspects of the hadronic decays of the heavy particles. In the W-boson-initiated jets, all the predictions are incompatible with the measurement. In the top quark initiated jets, disagreement with all predictions is observed in smaller subregions of the plane, and with a subset of the predictions across the fiducial plane. The measurement could be used to improve the tuning of Monte Carlo generators, for better modelling of hadronic decays of heavy quarks and bosons, or to improve the performance of jet taggers. © The Author(s) 2025. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
Bosons, Charged particles, Decay (organic), Fighter aircraft, Germanium compounds, Hadrons, Monte Carlo methods, Particle detectors, Tellurium compounds, ATLAS detectors, Hadronic decays, Hadronic jets, Measurements of, Parton showers, Sub-structures, Top quarks, Transverse momenta, Two-dimensional, W bosons, Forecasting
in
European Physical Journal C
volume
85
issue
4
article number
416
publisher
Springer Nature
external identifiers
  • scopus:105012430403
ISSN
1434-6044
DOI
10.1140/epjc/s10052-025-13924-5
language
English
LU publication?
yes
id
0b0adc50-311e-40de-9eb6-89a5035c8202
date added to LUP
2026-03-19 12:59:01
date last changed
2026-03-19 12:59:32
@article{0b0adc50-311e-40de-9eb6-89a5035c8202,
  abstract     = {{The Lund jet plane (LJP) is measured for the first time in tt¯ events, using 140 fb-1 of s=13 TeV pp collision data collected with the ATLAS detector at the LHC. The LJP is a two-dimensional observable of the sub-structure of hadronic jets that acts as a proxy for the kinematics of parton showers and hadron formation. The observable is constructed from charged particles and is measured for R=1.0 anti-kt jets with transverse momentum above 350 GeV containing the full decay products of either a top quark or a daughter W boson. The other top quark in the event is identified from its decay into a b-quark, an electron or a muon and a neutrino. The measurement is corrected for detector effects and compared with a range of Monte Carlo predictions sensitive to different aspects of the hadronic decays of the heavy particles. In the W-boson-initiated jets, all the predictions are incompatible with the measurement. In the top quark initiated jets, disagreement with all predictions is observed in smaller subregions of the plane, and with a subset of the predictions across the fiducial plane. The measurement could be used to improve the tuning of Monte Carlo generators, for better modelling of hadronic decays of heavy quarks and bosons, or to improve the performance of jet taggers. © The Author(s) 2025.}},
  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 Simpson, N.D. and Smirnova, O. and Wallin, E.J. and Zwalinski, L.}},
  issn         = {{1434-6044}},
  keywords     = {{Bosons; Charged particles; Decay (organic); Fighter aircraft; Germanium compounds; Hadrons; Monte Carlo methods; Particle detectors; Tellurium compounds; ATLAS detectors; Hadronic decays; Hadronic jets; Measurements of; Parton showers; Sub-structures; Top quarks; Transverse momenta; Two-dimensional; W bosons; Forecasting}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{Springer Nature}},
  series       = {{European Physical Journal C}},
  title        = {{Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-025-13924-5}},
  doi          = {{10.1140/epjc/s10052-025-13924-5}},
  volume       = {{85}},
  year         = {{2025}},
}