  In high energy heavy ion collisions at RHIC there are important aspects of
the medium induced dynamics, that are still not well understood. In particular,
there is a broadening and even a double hump structure of the away-side peak
appearing in azimuthal correlation studies in Au+Au collisions which is absent
in p+p collisions at the same energies. These features are already present but
suppressed in p+p collisions: 2 to 3 parton processes produce such structures
but are suppressed with respect to 2 to 2 processes. We argue that in A+A
collisions the different geometry for the trajectories of 3 as opposed to 2
particles in the final state, together with the medium induced energy loss
effects on the different cross sections, create a scenario that enhances
processes with 3 particles in the final state, which gives on average this
double hump structure.
