Franconi, L.; Miucci, A.; Merlassino, C.; Haug, S.; Weber, M. S.; Anders, J. K.; Beck, H. P.; Ereditato, A. (2019). Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at \sqrts\mathrmNN = 5.02 TeV with the ATLAS detector. Physical review. C - nuclear physics, 100(6) American Institute of Physics 10.1103/PhysRevC.100.064901
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Studies of the fragmentation of jets into charged particles in heavy-ion collisions can provide information about the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. This paper presents a measurement of the angular distribution of charged particles around the jet axis in √sNN=5.02 TeV Pb+Pb and pp collisions, using the ATLAS detector at the LHC. The Pb+Pb and pp data sets have integrated luminosities of 0.49nb−1 and 25pb−1, respectively. The measurement is performed for jets reconstructed with the anti-kt algorithm with radius parameter R=0.4 and is extended to an angular distance of r=0.8 from the jet axis. Results are presented as a function of Pb+Pb collision centrality and distance from the jet axis for charged particles with transverse momenta in the 1- to 63-GeV range, matched to jets with transverse momenta in the 126- to 316-GeV range and an absolute value of jet rapidity of less than 1.7. Modifications to the measured distributions are quantified by taking a ratio to the measurements in pp collisions. Yields of charged particles with transverse momenta below 4 GeV are observed to be increasingly enhanced as a function of angular distance from the jet axis, reaching a maximum at r=0.6. Charged particles with transverse momenta above 4 GeV have an enhanced yield in Pb+Pb collisions in the jet core for angular distances up to r=0.05 from the jet axis, with a suppression at larger distances.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) |
UniBE Contributor: |
Franconi, Laura, Miucci, Antonio, Merlassino, Claudia, Haug, Sigve, Weber, Michele, Anders, John Kenneth, Beck, Hans Peter, Ereditato, Antonio |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0556-2813 |
Publisher: |
American Institute of Physics |
Language: |
English |
Submitter: |
BORIS Import LHEP |
Date Deposited: |
01 May 2020 14:17 |
Last Modified: |
05 Dec 2022 15:38 |
Publisher DOI: |
10.1103/PhysRevC.100.064901 |
Additional Information: |
Es sind nur die Berner Autoren namentlich erwaehnt |
BORIS DOI: |
10.7892/boris.143557 |
URI: |
https://boris.unibe.ch/id/eprint/143557 |
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