Preprint PUBDB-2023-03772

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

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2023

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Report No.: CERN-EP-2022-043; arXiv:2204.13530

Abstract: This paper presents a measurement of b-jet production in Pb+Pb and pp collisions at $\sqrt{s_{_\text {NN}}}=5.02$ TeV with the ATLAS detector at the LHC. The measurement uses 260 $\text {pb}^{-1}$ of pp collisions collected in 2017 and 1.4 $\text {nb}^{-1}$ of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti-$k_{t}$ 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 $R= 0.2$ and $R= 0.4$, and only $R= 0.2$ jets are used in Pb+Pb collisions. For comparison, inclusive $R= 0.2$ jets are also measured using 1.7 $\text {nb}^{-1}$ of Pb+Pb collisions collected in 2018 and the same pp collision data as the b-jet measurement. The nuclear modification factor, $R_\text {AA}$, is calculated for both b-jets and inclusive jets with $R= 0.2$ 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 $R_\text {AA}$ to inclusive jet $R_\text {AA}$ is also presented and suggests that the $R_\text {AA}$ 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.

Keyword(s): jet, bottom ; bottom, semileptonic decay ; muon, momentum ; heavy ion, scattering ; p p, scattering ; jet: bottom ; muon: momentum ; heavy ion: scattering ; p p: scattering ; nucleus ; ATLAS ; TeV ; energy loss ; GeV ; semileptonic decay ; peripheral ; transverse momentum ; CERN LHC Coll ; impact parameter ; experimental results ; 5020 GeV-cms/nucleon

Classification:

Contributing Institute(s):
  1. Experiment ATLAS (Z_ATLAS)
Research Program(s):
  1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
Experiment(s):
  1. LHC: ATLAS

Appears in the scientific report 2023
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Creative Commons Attribution CC BY 4.0 ; OpenAccess ; Published
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Measurement of the nuclear modification factor of $b$-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector
The European physical journal / C 83(5), 438 () [10.1140/epjc/s10052-023-11427-9]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


 Record created 2023-06-14, last modified 2024-01-12


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