Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector

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dc.citation.articleNumber014904en_US
dc.citation.issueNumber1en_US
dc.citation.journalTitlePhysical Review Cen_US
dc.citation.volumeNumber92en_US
dc.contributor.authorSTAR Collaborationen_US
dc.date.accessioned2018-12-12T18:59:21Zen_US
dc.date.available2018-12-12T18:59:21Zen_US
dc.date.issued2015en_US
dc.description.abstractWe present results of analyses of two-pion interferometry in Au+Au collisions at √sNN=7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV measured in the STAR detector as part of the BNL Relativistic Heavy Ion Collider Beam Energy Scan program. The extracted correlation lengths (Hanbury-Brown–Twiss radii) are studied as a function of beam energy, azimuthal angle relative to the reaction plane, centrality, and transverse mass (mT) of the particles. The azimuthal analysis allows extraction of the eccentricity of the entire fireball at kinetic freeze-out. The energy dependence of this observable is expected to be sensitive to changes in the equation of state. A new global fit method is studied as an alternate method to directly measure the parameters in the azimuthal analysis. The eccentricity shows a monotonic decrease with beam energy that is qualitatively consistent with the trend from all model predictions and quantitatively consistent with a hadronic transport model.en_US
dc.identifier.citationSTAR Collaboration. "Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector." <i>Physical Review C,</i> 92, no. 1 (2015) American Physical Society: https://doi.org/10.1103/PhysRevC.92.014904.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevC.92.014904en_US
dc.identifier.urihttps://hdl.handle.net/1911/103841en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleBeam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detectoren_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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