dorsal/arxiv
View SchemaStrangeness and Pion Production as Signals of QCD Phase Transition
| Authors | Marek Gazdzicki |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9706036 |
| URL | https://arxiv.org/abs/nucl-th/9706036 |
| DOI | 10.1088/0954-3899/23/12/012 |
| Journal | J.Phys.G23:1881-1888,1997 |
Abstract
A systematic analysis of data on strangeness and pion production in nucleon-nucleon and central nucleus-nucleus collisions is presented. It is shown that at all collision energies the pion/baryon and strangeness/pion ratios indicate saturation with the size of the colliding nuclei. The energy dependence of the saturation level suggests that the transition to the Quark Gluon Plasma occurs between 15 AGeV/c (BNL AGS) and 160 AGeV/c (CERN SPS) collision energies. The experimental results interpreted in the framework of a statistical approach show that the effective number of degrees of freedom increases in the course of the phase transition and that the plasma created at CERN SPS energies may have a temperature of about 280 MeV (energy density 10 GeV/fm-3). The presence of the phase transition can lead to the non-monotonic collision energy dependence of the strangeness/pion ratio. After an initial increase the ratio should drop to the characteristic value for the QGP. Above the transition region the ratio is expected to be collision energy independent. Experimental studies of central Pb+Pb collisions in the energy range 20--160 AGeV/c are urgently needed in order to localize the threshold energy, and study the properties of the QCD phase transition.
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"abstract": "A systematic analysis of data on strangeness and pion production in\nnucleon-nucleon and central nucleus-nucleus collisions is presented. It is\nshown that at all collision energies the pion/baryon and strangeness/pion\nratios indicate saturation with the size of the colliding nuclei. The energy\ndependence of the saturation level suggests that the transition to the Quark\nGluon Plasma occurs between 15 AGeV/c (BNL AGS) and 160 AGeV/c (CERN SPS)\ncollision energies. The experimental results interpreted in the framework of a\nstatistical approach show that the effective number of degrees of freedom\nincreases in the course of the phase transition and that the plasma created at\nCERN SPS energies may have a temperature of about 280 MeV (energy density 10\nGeV/fm-3). The presence of the phase transition can lead to the non-monotonic\ncollision energy dependence of the strangeness/pion ratio. After an initial\nincrease the ratio should drop to the characteristic value for the QGP. Above\nthe transition region the ratio is expected to be collision energy independent.\nExperimental studies of central Pb+Pb collisions in the energy range 20--160\nAGeV/c are urgently needed in order to localize the threshold energy, and study\nthe properties of the QCD phase transition.",
"arxiv_id": "nucl-th/9706036",
"authors": [
"Marek Gazdzicki"
],
"categories": [
"nucl-th"
],
"doi": "10.1088/0954-3899/23/12/012",
"journal_ref": "J.Phys.G23:1881-1888,1997",
"title": "Strangeness and Pion Production as Signals of QCD Phase Transition",
"url": "https://arxiv.org/abs/nucl-th/9706036"
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