The initial state of ultra-relativistic heavy ion collision

Details The initial state of ultra-relativistic heavy ion collision The initial state of ultra-relativistic heavy ion collision

2000-10-26

arxiv.org/abs/hep-ph/0010307v2

Phys.Rev. C64 (2001) 014901

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 9 figures. The presentation has been changed considerably. Some parts of the model have been reformulated, what led

Scientific paper

10.1103/PhysRevC.64.014901

A model for energy, pressure and flow velocity distributions at the beginning of ultra-relativistic heavy ion collisions is presented, which can be used as an initial condition for hydrodynamic calculations. Our model takes into account baryon recoil for both target and projectile, arising from the acceleration of partons in an effective field, produced in the collision. The typical field strength (string tension) for RHIC energies is about 5-12 GeV/fm, what allows us to talk about "string ropes". The results show that a QGP forms a tilted disk, such that the direction of the largest pressure gradient stays in the reaction plane, but deviates from both the beam and the usual transverse flow directions. Such initial conditions may lead to the creation of "antiflow" or "third flow component".

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