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          Institute: MPI für Physik     Collection: YB 2016     Display Documents



ID: 716319.0, MPI für Physik / YB 2016
Beam-energy-dependent Two-pion Interferometry and the Freeze-out Eccentricity of Pions Measured in Heavy Ion Collisions at the STAR Detector
Authors:STAR Collaboration; Adamczyk, L.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:92
Start Page:014904
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We 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.
Classification / Thesaurus:STAR
Comment of the Author/Creator:11 pages, 5 figures, 15 tables. Submitted to PRL
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2015-359
URL:http://inspirehep.net/search?p=find+eprint+1403.49...
URL:http://arXiv.org/abs/arxiv:1403.4972
URL:https://publications.mppmu.mpg.de/?action=search&m...
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