Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-03-12
Phys.Rev.Lett.103:152303,2009
Physics
Nuclear Physics
Nuclear Theory
4 pages, 3 figures, revtex4, intro modified, typos corrected
Scientific paper
10.1103/PhysRevLett.103.152303
Hard partons moving through a dense QCD medium lose energy by radiative emissions and elastic scatterings. Deposition of the radiative contribution into the medium requires rescattering of the radiated gluons. We compute the total energy loss and its deposition into the medium self-consistently within the same formalism, assuming perturbative interaction between probe and medium. The same transport coefficients that control energy loss of the hard parton determine how the energy is deposited into the medium; this allows a parameter free calculation of the latter once the former have been computed or extracted from experimental energy loss data. We compute them for a perturbative medium in hard thermal loop (HTL) approximation. Assuming that the deposited energy-momentum is equilibrated after a short relaxation time, we compute the medium's hydrodynamical response and obtain a conical pattern that is strongly enhanced by showering.
Heinz Ulrich
Majumder Abhijit
Qin Guang-You
Song Hui-chao
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