Mass ordering of differential elliptic flow and its violation for {phi} mesons
Journal Article
·
· Physical Review. C, Nuclear Physics
- Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan)
- Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)
- Nuclear Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794-3400 (United States)
- Akita International University, 193-2 Okutsubakidai, Yuwa-Tsubakigawa, Akita 010-1211 (Japan)
We simulate the dynamics of Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC) with a hybrid model that treats the dense early quark-gluon plasma (QGP) stage macroscopically as an ideal fluid but models the dilute late hadron resonance gas (HG) microscopically using a hadronic cascade. By comparing with a pure hydrodynamic approach we identify effects of hadronic viscosity on the transverse momentum spectra and differential elliptic flow v{sub 2}(p{sub T}). We investigate the dynamical origins of the observed mass ordering of v{sub 2}(p{sub T}) for identified hadrons, focusing on dissipative effects during the late hadronic stage. Within our approach, we find that, at RHIC energies, much of the finally observed mass splitting is generated during the hadronic stage, due to buildup of additional radial flow. The {phi} meson, having a small interaction cross section, does not fully participate in this additional flow. As a result, it violates the mass-ordering pattern for v{sub 2}(p{sub T}) that is observed for other hadron species. We also show that the early decoupling of the {phi} meson from the hadronic rescattering dynamics leads to interesting and unambiguous features in the p{sub T} dependence of the nuclear suppression factor R{sub AA} and of the {phi}/p ratio.
- OSTI ID:
- 21189929
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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