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



Aad, G, Abbott, B, Abbott, DC, Abeling, K, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Hoffman, AC Abusleme
et al (show 2868 more authors) (2023) 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-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>This paper presents a measurement of <jats:italic>b</jats:italic>-jet production in Pb+Pb and <jats:italic>pp</jats:italic> collisions at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s_{_\text {NN}}}=5.02$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:msub> <mml:mrow /> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV with the ATLAS detector at the LHC. The measurement uses 260 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {pb}^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mtext>pb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> of <jats:italic>pp</jats:italic> collisions collected in 2017 and 1.4 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {nb}^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mtext>nb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti-<jats:inline-formula><jats:alternatives><jats:tex-math>$$k_{t}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>k</mml:mi> <mml:mi>t</mml:mi> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> algorithm. The <jats:italic>b</jats:italic>-jets are identified from a sample of jets containing muons from the semileptonic decay of <jats:italic>b</jats:italic>-quarks using template fits of the muon momentum relative to the jet axis. In <jats:italic>pp</jats:italic> collisions, <jats:italic>b</jats:italic>-jets are reconstructed for radius parameters <jats:inline-formula><jats:alternatives><jats:tex-math>$$R= 0.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.2</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$$R= 0.4$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.4</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>, and only <jats:inline-formula><jats:alternatives><jats:tex-math>$$R= 0.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.2</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> jets are used in Pb+Pb collisions. For comparison, inclusive <jats:inline-formula><jats:alternatives><jats:tex-math>$$R= 0.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.2</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> jets are also measured using 1.7 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {nb}^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mtext>nb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> of Pb+Pb collisions collected in 2018 and the same <jats:italic>pp</jats:italic> collision data as the <jats:italic>b</jats:italic>-jet measurement. The nuclear modification factor, <jats:inline-formula><jats:alternatives><jats:tex-math>$$R_\text {AA}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula>, is calculated for both <jats:italic>b</jats:italic>-jets and inclusive jets with <jats:inline-formula><jats:alternatives><jats:tex-math>$$R= 0.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.2</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> over the transverse momentum range of 80–290 GeV. The nuclear modification factor for <jats:italic>b</jats:italic>-jets decreases from peripheral to central collisions. The ratio of the <jats:italic>b</jats:italic>-jet <jats:inline-formula><jats:alternatives><jats:tex-math>$$R_\text {AA}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> to inclusive jet <jats:inline-formula><jats:alternatives><jats:tex-math>$$R_\text {AA}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> is also presented and suggests that the <jats:inline-formula><jats:alternatives><jats:tex-math>$$R_\text {AA}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> for <jats:italic>b</jats:italic>-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.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 21 Jun 2023 09:49
Last Modified: 18 Mar 2024 04:03
DOI: 10.1140/epjc/s10052-023-11427-9
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171183