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

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00021524
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Submitted on : Thursday, January 23, 2003 - 3:51:02 PM
Last modification on : Wednesday, April 27, 2022 - 3:51:52 AM

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M. Bleicher, Joerg Aichelin. Is the existence of a softest point in the directed flow excitation function an unambiguous signal for the creation of a quark gluon plasma?. Physics Letters B, Elsevier, 2005, 612, pp.201-206. ⟨10.1016/j.physletb.2005.02.035⟩. ⟨in2p3-00021524⟩

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