This paper presents a measurement of b-jet production in Pb+Pb and pp collisions at TeV with the ATLAS detector at the LHC. The measurement uses 260 of pp collisions collected in 2017 and 1.4 of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti- algorithm. The b-jets are identified from a sample of jets containing muons from the semileptonic decay of b-quarks using template fits of the muon momentum relative to the jet axis. In pp collisions, b-jets are reconstructed for radius parameters and , and only jets are used in Pb+Pb collisions. For comparison, inclusive jets are also measured using 1.7 of Pb+Pb collisions collected in 2018 and the same pp collision data as the b-jet measurement. The nuclear modification factor, , is calculated for both b-jets and inclusive jets with over the transverse momentum range of 80–290 GeV. The nuclear modification factor for b-jets decreases from peripheral to central collisions. The ratio of the b-jet to inclusive jet is also presented and suggests that the for b-jets is larger than that for inclusive jets in central Pb+Pb collisions. The measurements are compared with theoretical calculations and suggest a role for mass and colour-charge effects in partonic energy loss in heavy-ion collisions.

Measurement of the nuclear modification factor of b-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector / G. Aad, B.A.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 83:5(2023 May 25), pp. 438.1-438.32. [10.1140/epjc/s10052-023-11427-9]

Measurement of the nuclear modification factor of b-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector

A. Andreazza;M. Antonelli;E. Ballabene;A. Carbone;L. Carminati;S. D'Auria;U. De Sanctis;L. Dell'Asta;M. Fanti;M. Lazzaroni;S.M. Mazza;C. Meroni;D.P. Mungo;F. Piazza;F. Ragusa;A. Stabile;
2023

Abstract

This paper presents a measurement of b-jet production in Pb+Pb and pp collisions at TeV with the ATLAS detector at the LHC. The measurement uses 260 of pp collisions collected in 2017 and 1.4 of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti- algorithm. The b-jets are identified from a sample of jets containing muons from the semileptonic decay of b-quarks using template fits of the muon momentum relative to the jet axis. In pp collisions, b-jets are reconstructed for radius parameters and , and only jets are used in Pb+Pb collisions. For comparison, inclusive jets are also measured using 1.7 of Pb+Pb collisions collected in 2018 and the same pp collision data as the b-jet measurement. The nuclear modification factor, , is calculated for both b-jets and inclusive jets with over the transverse momentum range of 80–290 GeV. The nuclear modification factor for b-jets decreases from peripheral to central collisions. The ratio of the b-jet to inclusive jet is also presented and suggests that the for b-jets is larger than that for inclusive jets in central Pb+Pb collisions. The measurements are compared with theoretical calculations and suggest a role for mass and colour-charge effects in partonic energy loss in heavy-ion collisions.
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
25-mag-2023
https://link.springer.com/article/10.1140/epjc/s10052-023-11427-9
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/974290
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