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

Adamczyk L.
•
Adkins J. K.
•
Agakishiev G.
altro
Zyzak M.
2015
  • journal article

Periodico
PHYSICAL REVIEW. C, NUCLEAR PHYSICS
Abstract
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.
DOI
10.1103/PhysRevC.92.014904
WOS
WOS:000357807800003
Archivio
http://hdl.handle.net/11368/2945846
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84937012905
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.92.014904
Diritti
closed access
license:copyright editore
FVG url
https://arts.units.it/request-item?handle=11368/2945846
Soggetti
  • heavy-ions

Web of Science© citazioni
74
Data di acquisizione
Mar 8, 2024
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