Review of QGP signatures - ideas versus observables

Details Review of QGP signatures - ideas versus observables Review of QGP signatures - ideas versus observables

2004-01-15

arxiv.org/abs/nucl-th/0401031v3

Physics

Nuclear Physics

Nuclear Theory

17 pages, 7 figures, Invated talk presented by H. St\"ocker at the International Conference of the NATO Advanced Study Institu

Scientific paper

We investigate hadron production and transverse hadron spectra in nucleus-nucleus collisions from 2 $A\cdot$GeV to 21.3 $A\cdot$TeV within two independent transport approaches (UrQMD and HSD) based on quark, diquark, string and hadronic degrees of freedom. The enhancement of pion production in central Au+Au (Pb+Pb) collisions relative to scaled $pp$ collisions (the 'kink') is described well by both approaches without involving a phase transition. However, the maximum in the $K^+/\pi^+$ ratio at 20 to 30 A$\cdot$GeV (the 'horn') is missed by $\sim$ 40%. Also, at energies above $\sim$ 5 A$\cdot$GeV, the measured $K^{\pm}$ $m_{T}$-spectra have a larger inverse slope than expected from the models. Thus the pressure generated by hadronic interactions in the transport models at high energies is too low. This finding suggests that the additional pressure - as expected from lattice QCD at finite quark chemical potential and temperature - might be generated by strong interactions in the early pre-hadronic/partonic phase of central heavy-ion collisions. Finally, we discuss the emergence of density perturbations in a first-order phase transition and why they might affect relative hadron multiplicities, collective flow, and hadron mean-free paths at decoupling.

Affiliated with

Also associated with

No associations

Rating

Review of QGP signatures - ideas versus observables does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Review of QGP signatures - ideas versus observables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Review of QGP signatures - ideas versus observables will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-300178