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dc.contributor.authorALICE Collaboration
dc.contributor.authorBarnby, Lee
dc.date.accessioned2016-11-08T09:27:24Z
dc.date.available2016-11-08T09:27:24Z
dc.date.issued2016-09-28
dc.identifier.citationThe ALICE collaboration (2016). 'Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN = 2.76 TeV' J. High Energy. Phys. 2016: 164. doi:10.1007/JHEP09(2016)164en
dc.identifier.issn1029-8479
dc.identifier.doi10.1007/JHEP09(2016)164
dc.identifier.urihttp://hdl.handle.net/10545/620702
dc.description.abstractThe elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p+p̅ in Pb-Pb collisions at √sNN=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.
dc.description.sponsorshipScience and Technology Facilities Council (STFC), United Kingdomen
dc.language.isoenen
dc.publisherSpringeren
dc.publisherSCOAP3en
dc.relation.urlhttp://link.springer.com/10.1007/JHEP09(2016)164en
dc.relation.urlhttps://scoap3.org/en
dc.rightsArchived with thanks to Journal of High Energy Physicsen
dc.subjectQuark gluon plasmaen
dc.subjectRelativistic heavy ion collisionsen
dc.subjectLarge Hadron Collideren
dc.subjectHadron-Hadron scatteringen
dc.titleHigher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN = 2.76 TeVen
dc.typeArticleen
dc.contributor.departmentUniversity of Birmingham, United Kingdomen
dc.contributor.departmentEuropean Organization for Nuclear Research (CERN)en
dc.identifier.journalJournal of High Energy Physicsen
html.description.abstractThe elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p+p̅ in Pb-Pb collisions at √sNN=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.


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