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In high-energy nuclear collisions at LHC, where a QGP might be created, thedegree of thermalization at the partonic level is a key issue. Due to theirlarge mass, heavy quarks are a powerful tool to probe thermalization. Wepropose to measure azimuthal correlations of heavy-quark hadrons and theirdecay products. Changes or even the complete absence of these initiallyexisting azimuthal correlations in $Pb-Pb$ collisions might indicatethermalization at the partonic level. We present studies with PYTHIA for $p-p$collisions at 14 TeV using the two-particle transverse momentum correlator${<\overline{\Delta}p_{t,1}\overline{\Delta}p_{t,2}>}$ as a sensitive measureof potential changes in these azimuthal correlations. Contributions fromtransverse radial flow are estimated.

$D\overline{D}$ momentum correlations versus relative azimuth as a sensitive probe for thermalization