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Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector

ATLAS has measured the production of heavy flavor muons over $|\eta| {<} 1$ in $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb collisions and $\sqrt{s} = 2.76$ TeV $pp$ collisions at the LHC. The measurements are performed over the transverse momentum range $4 {<} p_T {<} 14$ GeV and for five Pb+Pb centra...

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Autor principal: The ATLAS collaboration
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/2055674
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author The ATLAS collaboration
author_facet The ATLAS collaboration
author_sort The ATLAS collaboration
collection CERN
description ATLAS has measured the production of heavy flavor muons over $|\eta| {<} 1$ in $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb collisions and $\sqrt{s} = 2.76$ TeV $pp$ collisions at the LHC. The measurements are performed over the transverse momentum range $4 {<} p_T {<} 14$ GeV and for five Pb+Pb centrality intervals. Backgrounds arising from in-flight pion and kaon decays, hadronic showers, and mis-reconstructed muons are statistically removed using a template fitting procedure. The heavy flavor muon differential cross-sections and per-event yields are measured in $pp$ and Pb+Pb collisions, respectively. The nuclear modification factor, $R_{AA}$, is observed to be in- dependent of $p_T$ within uncertainties and to be less than unity, which indicates suppressed production of heavy flavor muons in Pb+Pb collisions. For the most central interval measured (0–10%), $R_{AA} {\sim} 0.4$. The heavy flavor muon yield is measured as a function of the azimuthal angle difference, $\phi − \Psi_2$, where the experimental event plane angle, $\Psi_2$, is measured in forward calorimeters that cover $3.2 < |\eta| < 4.9$. Fourier coefficients associated with the $\cos{(2(\phi − \Psi_2))}$ modulation, $v_2$, are measured as a function of $p_T$ and centrality. They vary slowly with $p_T$ and show a systematic variation with centrality that is characteristic of other elliptic anisotropy measurements.
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language eng
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spelling cern-20556742021-04-18T19:38:41Zhttp://cds.cern.ch/record/2055674engThe ATLAS collaborationMeasurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detectorParticle Physics - ExperimentATLAS has measured the production of heavy flavor muons over $|\eta| {<} 1$ in $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb collisions and $\sqrt{s} = 2.76$ TeV $pp$ collisions at the LHC. The measurements are performed over the transverse momentum range $4 {<} p_T {<} 14$ GeV and for five Pb+Pb centrality intervals. Backgrounds arising from in-flight pion and kaon decays, hadronic showers, and mis-reconstructed muons are statistically removed using a template fitting procedure. The heavy flavor muon differential cross-sections and per-event yields are measured in $pp$ and Pb+Pb collisions, respectively. The nuclear modification factor, $R_{AA}$, is observed to be in- dependent of $p_T$ within uncertainties and to be less than unity, which indicates suppressed production of heavy flavor muons in Pb+Pb collisions. For the most central interval measured (0–10%), $R_{AA} {\sim} 0.4$. The heavy flavor muon yield is measured as a function of the azimuthal angle difference, $\phi − \Psi_2$, where the experimental event plane angle, $\Psi_2$, is measured in forward calorimeters that cover $3.2 < |\eta| < 4.9$. Fourier coefficients associated with the $\cos{(2(\phi − \Psi_2))}$ modulation, $v_2$, are measured as a function of $p_T$ and centrality. They vary slowly with $p_T$ and show a systematic variation with centrality that is characteristic of other elliptic anisotropy measurements.ATLAS-CONF-2015-053oai:cds.cern.ch:20556742015-09-28
spellingShingle Particle Physics - Experiment
The ATLAS collaboration
Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector
title Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector
title_full Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector
title_fullStr Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector
title_full_unstemmed Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector
title_short Measurement of the suppression and elliptic anisotropy of heavy flavor muons in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV with the ATLAS detector
title_sort measurement of the suppression and elliptic anisotropy of heavy flavor muons in pb+pb collisions at $\sqrt{s_{nn}} =2.76$ tev with the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2055674
work_keys_str_mv AT theatlascollaboration measurementofthesuppressionandellipticanisotropyofheavyflavormuonsinpbpbcollisionsatsqrtsnn276tevwiththeatlasdetector