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Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$

The differential yields of charged particles having pseudorapidity within $|\eta|<1$ are measured using 3.42 $\mu\mathrm{b}^{-1}$ of XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$ collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision...

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Autor principal: CMS Collaboration
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2317406
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description The differential yields of charged particles having pseudorapidity within $|\eta|<1$ are measured using 3.42 $\mu\mathrm{b}^{-1}$ of XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$ collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision centrality and transverse momentum, $p_{\mathrm{T}}$, from 0.5 to 100$~\mathrm{GeV}$. A previously reported $p_{\mathrm{T}}$ spectrum from pp collisions at $\sqrt{s}=5.02~\mathrm{TeV}$ is extrapolated in center-of-mass energy to form a suitable reference for comparison. The nuclear modification factors, $R^{*}_{\mathrm{AA}}$, are constructed with this extrapolated reference and compared to previous measurements and theoretical predictions. In head-on collisions the $R^{*}_{\mathrm{AA}}$ is suppressed by a factor of six in the $p_{\mathrm{T}}$ range of 6--9$~\mathrm{GeV}$ but increases to approximately 0.7 at $100~\mathrm{GeV}$. A ratio between the XeXe spectra and previously reported spectra from PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02~\mathrm{TeV}$ indicates a notably smaller suppression of charged-particle production for the same centrality selection and $p_{\mathrm{T}}>6~\mathrm{GeV}$. However, the suppression in XeXe events is slightly greater than in PbPb collisions when comparing selections having a similar number of participating nucleons.
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institution Organización Europea para la Investigación Nuclear
publishDate 2018
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spelling cern-23174062019-09-30T06:29:59Zhttp://cds.cern.ch/record/2317406CMS CollaborationCharged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$Nuclear Physics - ExperimentThe differential yields of charged particles having pseudorapidity within $|\eta|<1$ are measured using 3.42 $\mu\mathrm{b}^{-1}$ of XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$ collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision centrality and transverse momentum, $p_{\mathrm{T}}$, from 0.5 to 100$~\mathrm{GeV}$. A previously reported $p_{\mathrm{T}}$ spectrum from pp collisions at $\sqrt{s}=5.02~\mathrm{TeV}$ is extrapolated in center-of-mass energy to form a suitable reference for comparison. The nuclear modification factors, $R^{*}_{\mathrm{AA}}$, are constructed with this extrapolated reference and compared to previous measurements and theoretical predictions. In head-on collisions the $R^{*}_{\mathrm{AA}}$ is suppressed by a factor of six in the $p_{\mathrm{T}}$ range of 6--9$~\mathrm{GeV}$ but increases to approximately 0.7 at $100~\mathrm{GeV}$. A ratio between the XeXe spectra and previously reported spectra from PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02~\mathrm{TeV}$ indicates a notably smaller suppression of charged-particle production for the same centrality selection and $p_{\mathrm{T}}>6~\mathrm{GeV}$. However, the suppression in XeXe events is slightly greater than in PbPb collisions when comparing selections having a similar number of participating nucleons.CMS-PAS-HIN-18-004oai:cds.cern.ch:23174062018
spellingShingle Nuclear Physics - Experiment
CMS Collaboration
Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$
title Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$
title_full Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$
title_fullStr Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$
title_full_unstemmed Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$
title_short Charged-particle nuclear modification factors in XeXe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44~\mathrm{TeV}$
title_sort charged-particle nuclear modification factors in xexe collisions at $\sqrt{s_{\mathrm{nn}}}=5.44~\mathrm{tev}$
topic Nuclear Physics - Experiment
url http://cds.cern.ch/record/2317406
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