Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-03
Nucl.Phys. A757 (2005) 493-524
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages in RevTex with 20 postscript figures, final version
Scientific paper
10.1016/j.nuclphysa.2005.04.022
Multiple scattering, induced radiative energy loss and modified fragmentation functions of a heavy quark in nuclear matter are studied within the framework of generalized factorization in perturbative QCD. Modified heavy quark fragmentation functions and energy loss are derived in detail with illustration of the mass dependencies of the Landau-Pomeranchuk-Migdal interference effects and heavy quark energy loss. Due to the quark mass dependence of the gluon formation time, the nuclear size dependencies of nuclear modification of the heavy quark fragmentation function and heavy quark energy loss are 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 of the heavy quark is also significantly suppressed due to limited cone of gluon radiation imposed by the mass. Medium modification of the heavy quark fragmentation functions is found to be limited to the large $z$ region due to the form of heavy quark fragmentation functions in vacuum.
Wang Enke
Wang Xin-Nian
Zhang Ben-Wei
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