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Considering the collisional energy loss rates of heavy quarks from hard lightparton interactions the total energy loss of a charm quark for a static mediumhas been computed. For the energy range $E\sim (5-10)$ GeV of charm quark, itis found to be almost same order as that of radiative ones estimated to a firstorder opacity expansion. The collisional energy loss will become much moreimportant for lower energy charm quarks and this feature could be veryinteresting for phenomenology of hadrons spectra. Using such collisional energyloss rates we estimate the momentum loss distribution employing a Fokker-Planckequation and the total energy loss of a charm quark for an expandingquark-gluon plasma under conditions resembling the RHIC energies. Thefractional collisional energy loss is found to be suppressed by a factor of 5as compared to static case and does not depend linearly on the system size. Wealso investigate the heavy to light hadrons $D/\pi$ ratio at moderately large(5-10) GeV/$c$ transverse momenta and comment on its enhancement.Comment: 14 pages, 6 figures; this version is compiled with various sections  than the earlier one along with additional discussion, one extra figure (Fig.  3) and two new curves in Fig. 4 in support of one approximation; revised  version accepted in Phys. Rev.

Energy loss of charm quarks in the quark-gluon plasma: Collisional vs radiative losses