Speaker
Description
Heavy flavored mesons produced with high pT in heavy ion collisions collisions, reveal several specific features of the production mechanism:
(i) short time of jet formation by a highly virtual heavy quark;
(ii) enhancement of the fragmentation function at large fractional momenta of the heavy meson;
(iii) extremely short time of color neutralization and formation of the heavy flavored meson wave function;
(iv) short mean free path in the medium (no color transparency);
(v) the dead-cone effect in gluon radiation, and smallness of the QCD coupling lead to a considerable reduction of the rate of broadening (transport coefficient) of heavy vs light quarks. Non-universality of q-hat is confirmed by data, which are well described.
