| Thème(s) : |
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| Titre : |
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Saturation of $E_T/N_{ch}$ and Freeze-Out Criteria in Heavy-Ion Collisions |
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| Auteur : |
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J. Cleymans, R. Sahoo1, D. P. Mahapatra, D K Srivastava, S. Wheaton |
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| Laboratoire : |
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| Résumé : |
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The pseudorapidity densities of transverse energy, the charged particle multiplicity and their ratios, $E_T/N_{ch}$, are estimated at mid-rapidity, in a statistical-thermal model based on chemical freeze-out criteria, for a wide range of energies from GSI-AGS-SPS to RHIC. It has been observed that in nucleus-nucleus collisions, $E_T/N_{ch}$ increases rapidly with beam energy and remains approximately constant at about a value of 800 MeV for beam energies from SPS to RHIC. $E_T/N_{ch}$ has been observed to be almost independent of centrality at all measured energies. The statistical-thermal model describes the energy dependence as well as the centrality independence, qualitatively well. The values of $E_T/N_{ch}$ are related to the chemical freeze-out criterium, $E/N \approx 1 GeV$ valid for primordial hadrons. We have studied the variation of the average mass $(), N_{decays}/N_{primordial}, N_{ch}/N_{decays}$ and $E_T/N_{ch}$ with $\sqrt{s_{NN}}$ for all freeze-out criteria discussed in literature. These observables show saturation around SPS and higher $\sqrt{s_{NN}}$, like the chemical freeze-out temperature ($T_{ch}$). |
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| Type de publication : |
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Communications avec actes |
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Date de publication
ou d'écriture : |
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2008 |
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| Date de la présentation : |
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2008 |
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Nom du périodique
Titre de l'ouvrage : |
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Journal of Physics G: Nuclear and Particle Physics |
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| Audience : |
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internationale |
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| Volume : |
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35 |
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| Page/Article : |
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104147 |
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| Nom du colloque : |
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20th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2008 (QM 2008) |
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| Ville du colloque : |
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Jaipur |
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| Pays du colloque : |
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Inde |
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| Date du colloque (début) : |
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04/02/2008 |
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| Date du colloque (fin) : |
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10/02/2008 |
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| Commentaire : |
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7 pages, 3 figures, ORAL presentation in 20th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2008 (QM 2008), Jaipur, India, 4-10 Feb. 2008. To appear in Journal of Phys. G: Nucl. Part. Phys |
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