Medium induced gluon radiation off massive quarks fills the dead cone - INSPIRE

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Medium induced gluon radiation off massive quarks fills the dead cone

Dec, 2003

27 pages

Published in:

Phys.Rev.D 69 (2004) 114003

e-Print:

hep-ph/0312106 [hep-ph]

DOI:

10.1103/PhysRevD.69.114003

Report number:

CERN-TH-2003-301

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Abstract:

We calculate the transverse momentum dependence of the medium-induced gluon energy distribution radiated off massive quarks in spatially extended QCD matter. In the absence of a medium, the distribution shows a characteristic mass-dependent depletion of the gluon radiation for angles smaller than m/E, the so-called dead cone effect. Medium-modifications of this spectrum are calculated as a function of quark mass, initial quark energy, in-medium pathlength and density. Generically, medium-induced gluon radiation is found to fill the dead cone, but it is reduced at large gluon energies compared to the radiation off light quarks. We quantify the resulting mass-dependence for momentum-averaged quantities (gluon energy distribution and average parton energy loss), compare it to simple approximation schemes and discuss its observable consequences for nucleus-nucleus collisions at RHIC and LHC. In particular, our analysis does not favor the complete disappearance of energy loss effects from leading open charm spectra at RHIC.

Note:

27 pages LaTeX, 15 eps-figures Report-no: CERN-TH/2003-301

24.85.+p
12.38.Mh
quantum chromodynamics: matter
quark: massive
gluon: radiation
gluon: energy spectrum
transverse momentum dependence
energy loss
approximation: dipole
scattering: heavy ion

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