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

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The ALICE Collaboration , Acharya , S , Brucken , E J , Chang , B , Hilden , T E , Kim , D J , Krizek , F , Litichevskyi , V , Mieskolainen , M M , Orava , R , Parkkila , J E , Rak , J , Rytkonen , H , Räsänen , S , Saarinen , S , Slupecki , M , Snellman , T W , Trzaska , W H , Vargyas , M , Viinikainen , J & Zhou , Z 2020 , ' Exploration of jet substructure using iterative declustering in pp and Pb-Pb collisions at LHC energies ' , Physics Letters B , vol. 802 , 135227 . https://doi.org/10.1016/j.physletb.2020.135227

Title: Exploration of jet substructure using iterative declustering in pp and Pb-Pb collisions at LHC energies
Author: The ALICE collaboration; Acharya, S.; Brucken, E. J.; Chang, B.; Hilden, T. E.; Kim, D. J.; Krizek, F.; Litichevskyi, V.; Mieskolainen, M. M.; Orava, Risto; Parkkila, J. E.; Rak, J.; Rytkonen, H.; Räsänen, Sami; Saarinen, S.; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Vargyas, M.; Viinikainen, J.; Zhou, Z.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, The Czech Academy of Sciences
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Bergen
Date: 2020-03-10
Language: eng
Number of pages: 12
Belongs to series: Physics Letters B
ISSN: 0370-2693
URI: http://hdl.handle.net/10138/320504
Abstract: The ALICE collaboration at the CERN LHC reports novel measurements of jet substructure in pp collisions at root s = 7 TeV and central Pb-Pb collisions at root s(NN) = 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 z(g), 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. (C) 2020 The Author(s). Published by Elsevier B.V.
Subject: 114 Physical sciences
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