HAL : in2p3-00021524, version 1

arXiv : nucl-th/0205069

DOI : 10.1016/j.physletb.2005.02.035

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Physics Letters B 612 (2005) 201-206

Is the existence of a softest point in the directed flow excitation function an unambiguous signal for the creation of a quark gluon plasma?

M. Bleicher1, J. Aichelin1

(2005)

We investigate the claim that a minimum of the excitation function of the in-plane directed flow of nucleons in ultrarelativistic heavy-ion collisions is a ‘smoking gun' signature for the creation of a quark–gluon plasma (QGP). Employing a non-equilibrium transport approach we demonstrate that such a minimum is expected in heavy ion collisions and not related to the formation of a QGP. The minimum has its origin in the interplay between a decreasing scattering angle of the elastic collisions with increasing beam energy, which lowers the in-plane flow, and the onset of particle production which increases the in-plane flow. Thus, the interpretation of this minimum as a ‘smoking gun' signature for the creation of a QGP seems premature.

1 :	SUBATECH - Laboratoire SUBATECH Nantes

in2p3-00021524, version 1

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Contributeur : Peggy Bardon <>

Soumis le : Jeudi 23 Janvier 2003, 15:51:02

Dernière modification le : Jeudi 17 Novembre 2005, 10:35:14