Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC
| dc.creator | Broniowski, Wojciech | |
| dc.creator | Chojnacki, Mikolaj | |
| dc.creator | Florkowski, Wojciech | |
| dc.creator | Kisiel, Adam | |
| dc.date | 2008-01-28 | |
| dc.date.accessioned | 2026-07-07T11:55:38Z | |
| dc.date.available | 2026-07-07T11:55:38Z | |
| dc.description | We investigate the role of the initial condition used for the hydrodynamic evolution of the system formed in ultra-relativistic heavy-ion collisions and find that an appropriate choice motivated by the models of early-stage dynamics, specifically a simple two-dimensional Gaussian profile, leads to a uniform description of soft observables measured in the Relativistic Heavy-Ion Collider (RHIC). In particular, the transverse-momentum spectra, the elliptic-flow, and the Hanbury-Brown--Twiss correlation radii, including the ratio R_out/R_side as well as the dependence of the radii on the azimuthal angle (azHBT), are properly described. We use the perfect-fluid hydrodynamics with a realistic equation of state based on lattice calculations and the hadronic gas at high and low temperatures, respectively. We also show that the inclusion of the partonic free-streaming in the early stage allows to delay the start of the hydrodynamical description to comfortable times of the order of 1 fm/c. Free streaming broadens the initial energy-density profile, but generates the initial transverse and elliptic flow. The data may be described equally well when the hydrodynamics is started early, or with a delay due to partonic free-streaming. | |
| dc.description | 4 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/0801.4361 | |
| dc.identifier | http://arxiv.org/abs/0801.4361 | |
| dc.identifier | Phys.Rev.Lett.101:022301,2008 | |
| dc.identifier | doi:10.1103/PhysRevLett.101.022301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/205309 | |
| dc.subject | Nuclear Theory | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Experiment | |
| dc.title | Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC | |
| dc.type | text |