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Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC

The first measurements of anisotropy harmonics ($v_n$, $n=2-4$) in $\text{pPb}$ collisions at $\sqrt{s_{_{NN}}} = 8.16~\mathrm{TeV}$ is presented. In addition, measurements of event-by-event correlations of different $v_n$ in $\text{pp}$ at $\sqrt{s} = 13~\mathrm{TeV}$, $\text{pPb}$ at $\sqrt{s_{_{N...

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Autor principal: CMS Collaboration
Publicado: 2017
Materias:
Acceso en línea:http://cds.cern.ch/record/2244678
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description The first measurements of anisotropy harmonics ($v_n$, $n=2-4$) in $\text{pPb}$ collisions at $\sqrt{s_{_{NN}}} = 8.16~\mathrm{TeV}$ is presented. In addition, measurements of event-by-event correlations of different $v_n$ in $\text{pp}$ at $\sqrt{s} = 13~\mathrm{TeV}$, $\text{pPb}$ at $\sqrt{s_{_{NN}}} = 5.02$ and $8.16~\mathrm{TeV}$ and $\text{PbPb}$ at $\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}$ collision systems at the LHC are explored. New results of the $v_n$ harmonics in $8.16~\mathrm{TeV}$ $\text{pPb}$ collisions are extracted via long-range ($|\Delta\eta|>2$) two-particle correlations as a function of event multiplicity. The current measurement is reaching a very-high-multiplicity region beyond that achieved in $5.02~\mathrm{TeV}$ $\text{pPb}$ data collected in 2013. Event-by-event correlations among $v_2$, $v_3$ and $v_4$ harmonics are measured using the four-particle symmetric cumulant method in $\text{pp}$ and $\text{pPb}$, and compared to the large system of $\text{PbPb}$ collisions. For high-multiplicity (more than 100 tracks) $\text{pp}$ and $\text{pPb}$ events, the $v_2$ harmonic is found to have a negative correlation with the $v_3$ harmonic, while the $v_2$ and $v_4$ harmonics are positively correlated. Normalized by the two-particle $v_n$ harmonics, the correlation coefficients of $v_2$ and $v_3$ harmonics are quantitatively similar for $\text{pPb}$ and $\text{PbPb}$ data, while a strong system size dependence is observed for correlations of $v_2$ and $v_4$ harmonics. These new data provide important insights to the origin of collectivity observed in small collision systems.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-22446782019-09-30T06:29:59Zhttp://cds.cern.ch/record/2244678CMS CollaborationCorrelations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHCNuclear Physics - ExperimentThe first measurements of anisotropy harmonics ($v_n$, $n=2-4$) in $\text{pPb}$ collisions at $\sqrt{s_{_{NN}}} = 8.16~\mathrm{TeV}$ is presented. In addition, measurements of event-by-event correlations of different $v_n$ in $\text{pp}$ at $\sqrt{s} = 13~\mathrm{TeV}$, $\text{pPb}$ at $\sqrt{s_{_{NN}}} = 5.02$ and $8.16~\mathrm{TeV}$ and $\text{PbPb}$ at $\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}$ collision systems at the LHC are explored. New results of the $v_n$ harmonics in $8.16~\mathrm{TeV}$ $\text{pPb}$ collisions are extracted via long-range ($|\Delta\eta|>2$) two-particle correlations as a function of event multiplicity. The current measurement is reaching a very-high-multiplicity region beyond that achieved in $5.02~\mathrm{TeV}$ $\text{pPb}$ data collected in 2013. Event-by-event correlations among $v_2$, $v_3$ and $v_4$ harmonics are measured using the four-particle symmetric cumulant method in $\text{pp}$ and $\text{pPb}$, and compared to the large system of $\text{PbPb}$ collisions. For high-multiplicity (more than 100 tracks) $\text{pp}$ and $\text{pPb}$ events, the $v_2$ harmonic is found to have a negative correlation with the $v_3$ harmonic, while the $v_2$ and $v_4$ harmonics are positively correlated. Normalized by the two-particle $v_n$ harmonics, the correlation coefficients of $v_2$ and $v_3$ harmonics are quantitatively similar for $\text{pPb}$ and $\text{PbPb}$ data, while a strong system size dependence is observed for correlations of $v_2$ and $v_4$ harmonics. These new data provide important insights to the origin of collectivity observed in small collision systems.CMS-PAS-HIN-16-022oai:cds.cern.ch:22446782017
spellingShingle Nuclear Physics - Experiment
CMS Collaboration
Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC
title Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC
title_full Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC
title_fullStr Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC
title_full_unstemmed Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC
title_short Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC
title_sort correlations of azimuthal anisotropy harmonics in pp, ppb and pbpb collisions at the lhc
topic Nuclear Physics - Experiment
url http://cds.cern.ch/record/2244678
work_keys_str_mv AT cmscollaboration correlationsofazimuthalanisotropyharmonicsinppppbandpbpbcollisionsatthelhc