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Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions

Measurements of two-particle angular correlations between identified strange hadrons ($\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$) and unidentified charged particles, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, correspondi...

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Autor principal: CMS Collaboration
Publicado: 2014
Materias:
Acceso en línea:http://cds.cern.ch/record/1703011
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description Measurements of two-particle angular correlations between identified strange hadrons ($\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$) and unidentified charged particles, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35nb$^{-1}$, were collected during the 2013 LHC pPb run at a nucleon-nucleon center-of-mass energy of 5.02TeV by the CMS experiment. The results are compared to 2.76TeV semi-peripheral PbPb collision data, collected during the 2011 PbPb run, covering a similar range of particle multiplicities. The $\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$ are reconstructed via their topological secondary decays. The observed long-range correlations are characterized by the second-order ($v_2$) and third-order ($v_3$) anisotropy harmonics of $\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$, which are studied as a function of particle multiplicity and transverse momentum. For high-multiplicity pPb events, a particle-species dependence of $v_2$ and $v_3$ is observed. Divided by the number of constituent quarks, the $v_2$ and $v_3$ harmonics of $\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$ as a function of kinetic energy per quark fall on the same curve within 10--15$\%$ for each multiplicity class. This scaling is better than that observed in peripheral PbPb collisions.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-17030112019-09-30T06:29:59Zhttp://cds.cern.ch/record/1703011CMS CollaborationLong-range two-particle correlations with K0S and Lambda in pPb and PbPb collisionsNuclear Physics - ExperimentMeasurements of two-particle angular correlations between identified strange hadrons ($\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$) and unidentified charged particles, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35nb$^{-1}$, were collected during the 2013 LHC pPb run at a nucleon-nucleon center-of-mass energy of 5.02TeV by the CMS experiment. The results are compared to 2.76TeV semi-peripheral PbPb collision data, collected during the 2011 PbPb run, covering a similar range of particle multiplicities. The $\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$ are reconstructed via their topological secondary decays. The observed long-range correlations are characterized by the second-order ($v_2$) and third-order ($v_3$) anisotropy harmonics of $\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$, which are studied as a function of particle multiplicity and transverse momentum. For high-multiplicity pPb events, a particle-species dependence of $v_2$ and $v_3$ is observed. Divided by the number of constituent quarks, the $v_2$ and $v_3$ harmonics of $\text{K}_{\text{S}}^{0}$ and $\Lambda$/$\overline{\Lambda}$ as a function of kinetic energy per quark fall on the same curve within 10--15$\%$ for each multiplicity class. This scaling is better than that observed in peripheral PbPb collisions.CMS-PAS-HIN-14-002oai:cds.cern.ch:17030112014
spellingShingle Nuclear Physics - Experiment
CMS Collaboration
Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions
title Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions
title_full Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions
title_fullStr Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions
title_full_unstemmed Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions
title_short Long-range two-particle correlations with K0S and Lambda in pPb and PbPb collisions
title_sort long-range two-particle correlations with k0s and lambda in ppb and pbpb collisions
topic Nuclear Physics - Experiment
url http://cds.cern.ch/record/1703011
work_keys_str_mv AT cmscollaboration longrangetwoparticlecorrelationswithk0sandlambdainppbandpbpbcollisions