A1 Journal article (refereed)
Exploration of jet substructure using iterative declustering in pp and Pb–Pb collisions at LHC energies (2020)
ALICE Collaboration (2020). Exploration of jet substructure using iterative declustering in pp and Pb–Pb collisions at LHC energies. Physics Letters B, 802, 135227. DOI: 10.1016/j.physletb.2020.135227
JYU authors or editors
Publication details
All authors or editors: ALICE Collaboration
Journal or series: Physics Letters B
ISSN: 0370-2693
eISSN: 1873-2445
Publication year: 2020
Volume: 802
Article number: 135227
Publisher: Elsevier
Publication country: Netherlands
Publication language: English
DOI: http://doi.org/10.1016/j.physletb.2020.135227
Open Access: Publication published in an open access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67964
Web address of parallel published publication (pre-print): https://arxiv.org/abs/1905.02512
Abstract
The ALICE collaboration at the CERN LHC reports novel measurements of jet substructure in pp collisions at √s = 7 TeV and central Pb–Pb collisions at √sNN = 2.76 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 zg, 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.
Keywords: particle physics
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2020
Preliminary JUFO rating: 2
