Exploration of jet substructure using iterative declustering in pp and Pb–Pb collisions at LHC energies

S. Acharya , Daniel Dąbrowski , Kamil Deja , R. A. Diaz , Łukasz Graczykowski , Anna Marie Herghelegiu , Monika Jakubowska , Małgorzata Janik , Przemysław Karczmarczyk , A. M. Khan , S. A. Khan , J. Kim , J. S. Kim , J. Kim , J. Kim , J. Kim , Adam Kisiel , M. Kowalski , X. L. Li , Julian Myrcha , Piotr Nowakowski , Janusz Oleniacz , Brian Paul , Jan Pluta , Marta Janczuk-Richter , Przemysław Rokita , Krystian Rosłon , Maksymilian Schmidt , Tomasz Trzciński , Barbara Trzeciak , Ammar Zaman , Hanna Zbroszczyk , Piotr Nowakowski


The ALICE collaboration at the CERN LHC reports novel measurements of jet substructure in pp collisions at TeV and central Pb–Pb collisions at TeV. Jet substructure of track-based jets is explored via iterative declustering and grooming techniques. We present the measurement of the momentum sharing of two-prong substructure exposed via grooming, the , and its dependence on the opening angle, in both pp and Pb–Pb collisions. We also present the measurement of the distribution of the number of branches obtained in the iterative declustering of the jet, which is interpreted as the number of its hard splittings. In Pb–Pb collisions, we observe a suppression of symmetric splittings at large opening angles and an enhancement of splittings at small opening angles relative to pp collisions, with no significant modification of the number of splittings. The results are compared to predictions from various Monte Carlo event generators to test the role of important concepts in the evolution of the jet in the medium such as colour coherence.
Collective authorALICE Collaboration
Author S. Acharya - [Variable Energy Cyclotron Centre India]
S. Acharya,,
, Daniel Dąbrowski (FP / NPD)
Daniel Dąbrowski,,
- Nuclear Physics Division
, Kamil Deja (FEIT / ICS)
Kamil Deja,,
- The Institute of Computer Science
, R. A. Diaz - [Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear]
R. A. Diaz,,
, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, Anna Marie Herghelegiu - University of Medicine and Pharmacy “Carol Davila" (UMDCD) [Horia Hulubei National Institute of Physics and Nuclear Engineering]
Anna Marie Herghelegiu,,
, Monika Jakubowska (FoEE / ICIE)
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Przemysław Karczmarczyk (FP / NPD)
Przemysław Karczmarczyk,,
- Nuclear Physics Division
, A. M. Khan - [Huazhong Normal University]
A. M. Khan,,
et al.`
Total number of authors1025
Journal seriesPhysics Letters B, [Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics], ISSN 0370-2693, e-ISSN 1873-2445
Issue year2020
Publication size in sheets0.55
Article number135227
Keywords in Englishrelativistic heavy ion physics ; quark gluon plasma ; hard scattering ; jet physics ; experimental results
ASJC Classification3106 Nuclear and High Energy Physics
URL https://www.sciencedirect.com/science/article/pii/S0370269320300319?via%3Dihub
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 22-09-2020, ArticleFromJournal
Publication indicators GS Citations = 23.0; WoS Citations = 1; Scopus Citations = 5; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.548; WoS Impact Factor: 2018 = 4.162 (2) - 2018=3.627 (5)
Citation count*23 (2020-09-23)
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