  The collimation of energy inside medium-modified jets is investigated in the
leading logarithmic approximation of QCD. The
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations are
slightly modified by introducing splitting functions enhanced in the infrared
sector. As compared to elementary collisions in the vacuum, the angular
istribution of the jet energy is found to broaden in QCD media.

High Energy Physics - Phenomenology