Abstract

At RHIC, enhancements in the baryon-to-meson ratio for light hadrons and hadrons containing strange quarks have been observed in central heavy-ion collisions compared to those in p+p and peripheral heavy-ion collisions in the intermediate transverse momentum (pT) range (2<pT<6GeV/c). This can be explained by the hadronization mechanism involving multi-parton coalescence. Λc is the lightest charmed baryon with mass close to that of the D0 meson, and has shorter life time than D0 (cτ∼60μm). Different models predict different magnitudes of enhancement in the Λc/D0 ratio depending on the degree to which charm quarks are thermalized in the medium and how the coalescence mechanism is implemented.In these proceedings, we report the first measurement of Λc production in heavy-ion collisions using the Heavy Flavor Tracker at STAR. The invariant yield of Λc for 3<pT<6GeV/c is measured in 10–60% central Au+Au collisions at sNN=200GeV. The Λc/D0 ratio is compared to different model calculations, and the physics implications are discussed.

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