D-Dbar Correlations as a sensitive probe for thermalization in high-energy nuclear collisions

X. Zhu, M. Bleicher, S. L. Huang, K. Schweda, H. Stoecker, N. Xu, P. Zhuang

Published 2006-04-20, updated 2007-01-23Version 2

We propose to measure azimuthal correlations of heavy-flavor hadrons to address the status of thermalization at the partonic stage of light quarks and gluons in high-energy nuclear collisions. In particular, we show that hadronic interactions at the late stage cannot significantly disturb the initial back-to-back azimuthal correlations of DDbar pairs. Thus, a decrease or the complete absence of these initial correlations does indicate frequent interactions of heavy-flavor quarks and also light partons in the partonic stage, which are essential for the early thermalization of light partons.