Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-05-29
Indian J.Phys.85:873-877,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 figures, contributed to Quark Matter 2008, Jaipur, India
Scientific paper
10.1007/s12648-011-0092-9
We calculate radiative and collisional energy loss of hard partons traversing the quark-gluon plasma created at RHIC and compare the respective size of these contributions. We employ the AMY formalism for radiative energy loss and include additionally energy loss by elastic collisions. Our treatment of both processes is complete at leading order in the coupling, and accounts for the probabilistic nature of jet energy loss. We find that a solution of the Fokker-Planck equation for the probability density distributions of partons is necessary for a complete calculation of the nuclear modification factor $R_{AA}$ for pion production in heavy ion collisions. It is found that the magnitude of $R_{AA}$ is sensitive to the inclusion of both collisional and radiative energy loss, while the average energy is less affected by the addition of collisional contributions. We present a calculation of $R_{AA}$ for $\pi^0$ at RHIC, combining our energy loss formalism with a relativistic (3+1)-dimensional hydrodynamic description of the thermalized medium.
Gale Charles
Jeon Sangyong
Moore Guy D.
Mustafa Munshi G.
Qin Guang-You
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