  Modification of the hard jet substructure in terms of the Soft Drop jet
grooming algorithm observables is studied for three different scenarios of jet
quenching in a quark-gluon plasma: i) an explicit enhancement of the parton
splitting functions, ii) increased soft gluon emissions induced by an in-medium
virtuality gain, and iii) energy loss due to a drag force. Despite the fact
that first two scenarios both correspond to a radiative energy loss mechanism
and lead to similar modifications of parton showers, they are shown to have
very different impacts on the momentum balance of hard subjets. Simulations for
heavy-ion collisions based on the second scenario are presented and found to be
in a good agreement with the experimental data.
