Coherent multiple scattering effect in DIS

In nuclear medium, the parton can lose its energy by gluon radiation and collisional energy loss. In order to understand heavy quark energy loss, the collisional energy loss could be an important source for the observed suppression of hadron production.; We calculate the multiple scattering effect on single hadron production in semi-inclusive lepton-nucleus deeply inelastic scattering. We show that the quantum interference of multiple scattering amplitudes leads to suppression in hadron productions. At the leading power in medium length, the suppression can be approximately expressed in terms of a shift in zh of the fragmentation function, and could be therefore interpreted as the collisional energy loss. We compare our calculation with existing experimental data. Our approach can be extended to other observables in hadronic collisions.