After a discussion on the meaning of "jets" in the context of nucleus-nucleus
collisions, the distortions of the profile of a parton shower induced by the
presence of a medium is investigated in a QCD-inspired model that implements
the conservation of energy at each step of the shower evolution.Comment: 10 pages, 4 figures; talk given at the workshop "High-pT physics at
LHC 2009", February 4-7, Prague, Czech Republi
