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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
G. Martínez-Garcia1, S. Gadrat1, P. Crochet2

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.
1 :  SUBATECH - Laboratoire SUBATECH Nantes
2 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
Physique/Physique des Hautes Energies - Phénoménologie