CCAST, World Lab, Beijing 100080, Peoples R China
; Chinese Acad Sci, Shanghai Inst Nucl Res, Shanghai 201800, Peoples R China
; Chinese Acad Sci, Inst Modern Phys, Res Ctr Nucl Theory, Natl Lab Heavy Ion Accelerator, Lanzhou 730000, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
We End that in a chemically equilibrating baryon-rich quark-gluon matter, due to the slow cooling rate, high initial temperature, large gluon density as well as large fusion cross section of 99 --> c (c) over bar in the intermediate mass region, the gluon fusion 99 --> c (c) over bar provides a dominant contribution to dileptons with intermediate masses, resulting in the significant enhancement of intermediate mass dileptons.