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We study the diffusion of charm and beauty in the early stage of high energynuclear collisions at RHIC and LHC energies, considering the interaction ofthese heavy quarks with the evolving Glasma by means of the Wong equations. Incomparison with previous works, we add the longitudinal expansion as well as weestimate the effect of energy loss due to gluon radiation. We find that heavyquarks diffuse in the strong transverse color fields in the very early stage(0.2-0.3 fm/c) and this leads to a suppression at low $p_T$ and enhancement atintermediate low $p_T$. The shape of the observed nuclear suppression factorobtained within our calculations is in qualitative agreement with theexperimental results of the same quantity for $D-$mesons in proton-nucleuscollisions. We compute the nuclear suppression factor in nucleus-nucleuscollisions as well, for both charm and beauty, finding a substantial impact ofthe evolving Glasma phase on these, suggesting that initialization of heavyquarks spectra in the quark-gluon plasma phase should not neglect the earlyevolution in the strong gluon fields.

physical review. c

Diffusion of heavy quarks in the early stage of high-energy nuclear  collisions at energies available at the BNL Relativistic Heavy Ion Collider  and at the CERN Large Hadron Collider