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

Published 28 Apr 2022 in nucl-ex and hep-ex | (2204.13530v2)

Abstract: This paper presents a measurement of $b$-jet production in Pb+Pb and $pp$ collisions at $\sqrt{s_{\textrm{NN}}}=5.02$ TeV with the ATLAS detector at the LHC. The measurement uses 260 $\textrm{pb}{-1}$ of $pp$ collisions collected in 2017 and 1.4 $\textrm{nb}{-1}$ 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 $\textrm{nb}{-1}$ of Pb+Pb collisions collected in 2018 and the same $pp$ collision data as the $b$-jet measurement. The nuclear modification factor, $R_\textrm{AA}$, 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 $R_\textrm{AA}$ to inclusive jet $R_\textrm{AA}$ is also presented and suggests that the $R_\textrm{AA}$ 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.

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