| Thème(s) : |
 |
Physique/Physique des Hautes Energies - Phénoménologie
|
|
| Titre : |
|
Consequences of a $\Lambda_c/D$ enhancement effect on the non-photonic electron nuclear modification factor in central heavy ion collisions at RHIC energy |
|
| Auteur : |
|
G. Martínez-Garcia1, S. Gadrat1, P. Crochet2 |
|
| Laboratoire : |
|
|
|
| Résumé : |
|
The RHIC experiments have measured the nuclear modification factor R_AA of non-photonic electrons in Au+Au collisions at sqrt(s) = 200 GeV. This R_AA exhibits a large suppression for pt > 2 GeV/c which is commonly attributed to heavy-quark energy loss. In order to reproduce satisfactorily the data, energy-loss models assume a heavy-quark energy loss similar to that of light quarks. However, it is expected that the heavy-quark radiative energy loss is smaller than the light quark one because of the so-called dead-cone effect. In this paper, we show that a charm baryon/meson enhancement, as is observed for the light and strange quarks, can explain a part of the suppression. This phenomenon has been put forward in a previous work. At variance, we show here that a Λc/D ratio close to unity, as observed for the light and strange quarks, could explain 20–25% of the suppression of non-photonic electrons in central Au+Au collisions. This effect remains significant at relatively high non-photonic electron transverse momenta of 8–9 GeV/c. |
|
|
| Type de publication : |
|
Communications avec actes |
|
Date de publication
ou d'écriture : |
|
2008 |
|
| Date de la présentation : |
|
2007 |
|
Nom du périodique
Titre de l'ouvrage : |
|
Journal of Physics G: Nuclear and Particle Physics |
|
| Audience : |
|
internationale |
|
| Volume : |
|
35 |
|
| Page/Article : |
|
044023 |
|
|
| Nom du colloque : |
|
International Conference on Strangeness in Quark Matter (SQM 2007) |
|
| Ville du colloque : |
|
Levoca |
|
| Pays du colloque : |
|
Slovaquie |
|
| Date du colloque (début) : |
|
24/06/2007 |
|
| Date du colloque (fin) : |
|
29/06/2007 |
|
|
Récupérer au format
