207 articles – 1938 Notices  [english version]
 HAL : in2p3-00204695, version 1
 arXiv : 0801.1665
 Physical Review C 77 (2008) 064907
 Quantitative constraints on the transport properties of hot partonic matter from semi-inclusive single high transverse momentum pion suppression in Au+Au collisions at $\sqrt{S_{NN}}$ = 200 GeV
 PHENIX Collaboration(s)
 (2008)
 The PHENIX experiment has measured the suppression of semi-inclusive single high transverse momentum pi^0's in Au+Au collisions at sqrt(s_NN) = 200 GeV. The present understanding of this suppression is in terms of energy-loss of the parent (fragmenting) parton in a dense color-charge medium. We have performed a quantitative comparison between various parton energy-loss models and our experimental data. The statistical point-to-point uncorrelated as well as correlated systematic uncertainties are taken into account in the comparison. We detail this methodology and the resulting constraint on the model parameters of medium opacity, as characterized via the initial color-charge density dN^g/dy or the medium transport coefficient q^hat. We find that high transverse momentum pi^0 suppression in Au+Au collisions has sufficient accuracy to constrain these model dependent opacity parameters at the level of +/- 20-25% (1 standard deviation). These constraints include only the experimental uncertainties, and further studies are needed to compute the corresponding theoretical uncertainties. Extracting fundamental model-independent characteristics of the medium requires resolution of the differences in the model calculations.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0801.1665
 in2p3-00204695, version 1 http://hal.in2p3.fr/in2p3-00204695 oai:hal.in2p3.fr:in2p3-00204695 Contributeur : Suzanne Robert <> Soumis le : Mardi 15 Janvier 2008, 12:15:28 Dernière modification le : Vendredi 25 Juillet 2008, 14:53:05