OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

Mass ordering of differential elliptic flow and its violation for ϕ mesons

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/48159

Show full item record

Files Size Format View
fac_HeinzU_PhysicalReviewC_2008_77_4.pdf 509.6Kb PDF View/Open

Title: Mass ordering of differential elliptic flow and its violation for ϕ mesons
Creators: Hirano, Tetsufumi; Heinz, Ulrich; Kharzeev, Dmitri; Lacey, Roy; Nara, Yasushi
Issue Date: 2008-04-28
Publisher: American Physical Society
Citation: Tetsufumi Hirano, Ulrich Heinz, Dmitri Kharzeev, Roy Lacey, Yasushi Nara, "Mass ordering of differential elliptic flow and its violation for ϕ mesons," Physical Review C 77, no. 4 (2008), doi:10.1103/PhysRevC.77.044909
DOI: 10.1103/PhysRevC.77.044909
Abstract: 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_2(p_T). We investigate the dynamical origins of the observed mass ordering of v_2(p_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 ϕ 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_2(p_T) that is observed for other hadron species. We also show that the early decoupling of the ϕ meson from the hadronic rescattering dynamics leads to interesting and unambiguous features in the p_T dependence of the nuclear suppression factor R_AA and of the ϕ/p ratio.
ISSN: 1089-490X
URI: http://hdl.handle.net/1811/48159
Bookmark and Share