Nestor Armesto, Brian Cole, Charles Gale, William A. Horowitz, Peter Jacobs, Sangyong Jeon, Marco van Leeuwen, Abhijit Majumder, Berndt Muller, Guang-You Qin, Carlos A. Salgado, Bjorn Schenke, Marta Verweij, Xin-Nian Wang, Urs Achim Wiedemann
We review the currently available formalisms for radiative energy loss of a high-momentum parton in a dense strongly interacting medium. The underlying theoretical framework of the four commonly used formalisms is discussed and the differences and commonalities between the formalisms are highlighted. A quantitative comparison of the single gluon emission spectra as well as the energy loss distributions is given for a model system consisting of a uniform medium with a fixed length of L=2 fm and L=5 fm (the `Brick'). Sizable quantitative differences are found. The largest differences can be attributed to specific approximations that are made in the calculation of the radiation spectrum.
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http://arxiv.org/abs/1106.1106
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