HAL : in2p3-00268013, version 1
 arXiv : 0803.3940
 Saturation of $E_T/N_(ch)$ and Freeze-Out Criteria in Heavy-Ion CollisionsCleymans J., Sahoo R., Mahapatra D.P., Srivastava D. K., Wheaton S.Dans Journal of Physics G: Nuclear and Particle Physics - 20th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2008 (QM 2008), Jaipur : Inde (2008) - http://hal.in2p3.fr/in2p3-00268013
 Physique/Physique des Hautes Energies - Phénoménologie Physique/Physique Nucléaire Expérimentale
Saturation of $E_T/N_{ch}$ and Freeze-Out Criteria in Heavy-Ion Collisions
J. Cleymans, R. Sahoo1, D. P. Mahapatra, D K Srivastava, S. Wheaton
 1 : SUBATECH - Laboratoire SUBATECH Nantes http://www-subatech.in2p3.fr/ CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes 4, rue Alfred Kastler - 44070 Nantes Cedex 03 France
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 ($T_{ch}$).

Communications avec actes
2008
2008
Journal of Physics G: Nuclear and Particle Physics
internationale
35
104147

20th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2008 (QM 2008)
Jaipur
Inde
04/02/2008
10/02/2008

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
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0803.3940
 in2p3-00268013, version 1 http://hal.in2p3.fr/in2p3-00268013 oai:hal.in2p3.fr:in2p3-00268013 Contributeur : Dominique Girod <> Soumis le : Lundi 31 Mars 2008, 08:56:43 Dernière modification le : Jeudi 18 Septembre 2008, 10:39:01