Abstract
The systematic study of hadronic elliptic flow in various relativistic heavy ion collisions is important for the investigation of the initial geometry influence on the quark gluon plasma characteristics. The φ meson consists of strange and antistrange quarks and has a small interaction cross section with non-strange hadrons. Therefore, φ mesons are barely affected by late hadronic stage and reflect detailed information about hot and dense matter properties. Additionally, the comparison of elliptic flow for φ mesons to those of charged hadrons will provide additional information on the flavor dependence of flow. PHENIX has measured second order azimuthal anisotropy coefficients for φ mesons in Cu+Au collisions at √SNN = 200 GeV and in U+U collisions at √SNN = 193 GeV at midrapidity (| η | < 0.35). The obtained data suggest scaling of elliptic flow for φ mesons with eccentricity of participant nucleons in Cu+Au, U+U, and Au+Au collisions. Viscous hydrodynamic model iEBE-VISHNU provides a simultaneous description of the obtained data.
Highlights
One of the most important goals of the current ultra-relativistic heavy ion research is the investigation of the quark gluon plasma (QGP) [1] properties
The φ-mesons mostly decay after the QGP phase [1, 5], φ kinematic properties are not affected by hadronic stage and bring detailed information of the QGP properties
If the hadronic v2 is proportional to the number of valence quarks nq of the hadron, the flowing medium reflects quark degrees of freedom, otherwise hadronic stage is responsible for elliptic flow development [2]
Summary
One of the most important goals of the current ultra-relativistic heavy ion research is the investigation of the quark gluon plasma (QGP) [1] properties. Study of second order azimuthal anisotropy has played a key role in the establishment of the QGP formation at the Relativistic Heavy Ion Collider [2]. This model has proved itself valid for recent PHENIX results on elliptic and triangular flow for charged hadrons, published in the Nature Physics [10].
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