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Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector

This note presents measurement of the nuclear modification factor of large-radius jets in $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72 nb$^{-1}$ and 257 pb$^{-1}$ of Pb+Pb and $pp$ data, respectively. The large-radius jets are...

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Autor principal: The ATLAS collaboration
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:http://cds.cern.ch/record/2701506
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author The ATLAS collaboration
author_facet The ATLAS collaboration
author_sort The ATLAS collaboration
collection CERN
description This note presents measurement of the nuclear modification factor of large-radius jets in $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72 nb$^{-1}$ and 257 pb$^{-1}$ of Pb+Pb and $pp$ data, respectively. The large-radius jets are reconstructed with the anti-$k_{t}$ algorithm using a radius parameter of $R = 1.0$, by re-clustering anti-$k_{t}$ $R = 0.2$ jets having transverse momenta, $p_{\mathrm{T}} > 35$~\GeV. After applying a trimming procedure, the large-radius jet constituents are re-clustered using the $k_{t}$ algorithm in order to obtain the splitting parameter, $\sqrt{d_{12}}$, which characterizes the transverse momentum scale for the hardest splitting in the jet. The yield of the $R = 1.0$ jets is measured as a function of $p_{\mathrm{T}}$ and $\sqrt{d_{12}}$ over the rapidity and transverse momentum ranges, $|y| < 2$ and $156 < p_{\mathrm{T}} < 1000$ GeV, respectively. The nuclear modification factor, $R_{\mathrm{AA}}$, obtained by comparing the Pb+Pb jet yields to those in $pp$ collisions, is measured as a function of jet transverse momentum and $\sqrt{d_{12}}$. A significant evolution of $R_{\mathrm{AA}}$ with $\sqrt{d_{12}}$ is observed at small $\sqrt{d_{12}}$ values, indicating a significant difference in the quenching of large-radius jets having single sub-jet and those with more complex substructure. The inclusive jet $R_{\mathrm{AA}}$, integrated over $\sqrt{d_{12}}$, is qualitatively similar to that obtained in previous measurements for $R=0.4$ jets.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
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spelling cern-27015062023-01-16T13:05:03Zhttp://cds.cern.ch/record/2701506engThe ATLAS collaborationMeasurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detectorParticle Physics - ExperimentThis note presents measurement of the nuclear modification factor of large-radius jets in $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72 nb$^{-1}$ and 257 pb$^{-1}$ of Pb+Pb and $pp$ data, respectively. The large-radius jets are reconstructed with the anti-$k_{t}$ algorithm using a radius parameter of $R = 1.0$, by re-clustering anti-$k_{t}$ $R = 0.2$ jets having transverse momenta, $p_{\mathrm{T}} > 35$~\GeV. After applying a trimming procedure, the large-radius jet constituents are re-clustered using the $k_{t}$ algorithm in order to obtain the splitting parameter, $\sqrt{d_{12}}$, which characterizes the transverse momentum scale for the hardest splitting in the jet. The yield of the $R = 1.0$ jets is measured as a function of $p_{\mathrm{T}}$ and $\sqrt{d_{12}}$ over the rapidity and transverse momentum ranges, $|y| < 2$ and $156 < p_{\mathrm{T}} < 1000$ GeV, respectively. The nuclear modification factor, $R_{\mathrm{AA}}$, obtained by comparing the Pb+Pb jet yields to those in $pp$ collisions, is measured as a function of jet transverse momentum and $\sqrt{d_{12}}$. A significant evolution of $R_{\mathrm{AA}}$ with $\sqrt{d_{12}}$ is observed at small $\sqrt{d_{12}}$ values, indicating a significant difference in the quenching of large-radius jets having single sub-jet and those with more complex substructure. The inclusive jet $R_{\mathrm{AA}}$, integrated over $\sqrt{d_{12}}$, is qualitatively similar to that obtained in previous measurements for $R=0.4$ jets.ATLAS-CONF-2019-056oai:cds.cern.ch:27015062019-11-14
spellingShingle Particle Physics - Experiment
The ATLAS collaboration
Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector
title Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector
title_full Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector
title_fullStr Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector
title_full_unstemmed Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector
title_short Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb at 5.02 TeV by ATLAS detector
title_sort measurement of suppression of large-radius jets and its dependence on substructure in pb+pb at 5.02 tev by atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2701506
work_keys_str_mv AT theatlascollaboration measurementofsuppressionoflargeradiusjetsanditsdependenceonsubstructureinpbpbat502tevbyatlasdetector