212 articles – 1955 Notices  [english version]
 HAL : in2p3-00265483, version 1
 International Conference on Strangeness in Quark Matter (SQM 2007), Levoca : Slovaquie (2007)
 Consequences of a $\Lambda_c/D$ enhancement effect on the non-photonic electron nuclear modification factor in central heavy ion collisions at RHIC energy
 (2008)
 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.
 Thème(s) : Physique/Physique des Hautes Energies - Phénoménologie
 in2p3-00265483, version 1 http://hal.in2p3.fr/in2p3-00265483 oai:hal.in2p3.fr:in2p3-00265483 Contributeur : Dominique Girod <> Soumis le : Mercredi 19 Mars 2008, 13:35:41 Dernière modification le : Mercredi 19 Mars 2008, 13:41:00