Multiple scattering, modified fragmentation functions, and radiative energy loss of a heavy-quark propagating in a nuclear medium are investigated in perturbative QCD. Because of the quark mass dependence of the gluon formation time, the medium size dependence of heavy-quark energy loss is found to change from a linear to a quadratic form when the initial energy and momentum scale are increased relative to the quark mass. The radiative energy loss is also significantly suppressed relative to a light quark due to the suppression of collinear gluon emission by a heavy quark
quarksgluonsand QCD in nuclei and nuclear processesperturbative calculationsphoton and charged-lepton interactions with hadronsproduction
Ben-Wei Zhang、Enke Wang、Xin-Nian Wang
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Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China
NETL
NSTL
