Heavy Hadrons Production by Coalescence Plus Fragmentation in AA Collisions at RHIC and LHC

Abstract

The hadronization process of heavy hadrons with bottom and charm quarks, especially for baryons Λ c , in a dense QGP medium is largely not understood. We present within a coalescence plus fragmentation model the predictions for D 0 and Λ c spectra and the related baryon to meson ratios at RHIC and LHC. We will discuss how our model can predict values for Λ c / D 0 of the order of O(1), which is much larger than the expectations from fragmentation, and in agreement whit early data from STAR collaboration. Furthermore in the same scheme can be predicted a baryon to meson ratio Λ c / D 0 in pp collisions assuming that at the LHC top energies there can be the formation of QGP matter. The results show a considerable volume effects that significantly reduce the ratios, but still predict quite larger values with respect to fragmentation, in agreement with recent data from ALICE in pp collisions.

Keywords

• heavy ion collision
• hadronization
• heavy quark transport