Comparison of Jet Quenching Formalisms for a Quark-Gluon Plasma "Brick"

Abstract

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.

30 pages, 24 figures update version2: added curves with large x to Figure 14, Higher Twist curves to Figs 19, 20, plus some changes in the text (introduction/summary, discussion of Fig 14 and HT section)

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