Abstract: The quenching of jets (and high-pT particle spectra) observed in heavy-ion collisions is interpreted  as due to the energy lost by hard partons crossing the Quark Gluon Plasma. In my seminar I will review recent  efforts to include in its modeling important qualitative features of QCD, like the correlations in multiple  gluon emissions and the color-flow pattern in parton branchings. In particular, the modification of color  connections among the partons of a shower developing in the presence of a medium is a generic occurrence  accompanying parton energy-loss. I will show how this effect can leave its fingerprints at the hadronization stage,  leading by itself to a softening of hadron spectra and to an enhanced production of soft particles in jet-fragmentation.

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