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The RHIC experiments have measured the nuclear modification factor R_AA ofnon-photonic electrons in Au+Au collisions at sqrt(s) = 200 GeV. This R_AAexhibits a large suppression for pt > 2 GeV/c which is commonly attributed toheavy-quark energy loss. It is expected that the heavy-quark radiative energyloss is smaller than the light quark one because of the so-called dead-coneeffect. An enhancement of the charm baryon yield with respect to the charmmeson yield, as it is observed for light and strange hadrons, can explain partof the suppression. This phenomenon has been put forward in a previous work. Wepresent in this paper a more complete study based on a detailed simulationwhich includes electrons from charm and bottom decay, charm and bottom quarkrealistic energy loss as well as a more realistic modeling of the Lambda_c/Denhancement. We show that a Lambda_c/D ratio close to unity, as observed forlight and strange quarks, could explain 20-25% of the suppression ofnon-photonic electrons in central Au+Au collisions. This effect remainssignificant at relatively high non-photonic electron transverse momenta of 8-9GeV/c.

Consequences of a Lambda_c/D enhancement effect on the non-photonic  electron nuclear modification factor in central heavy ion collisions at RHIC  energy