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- W1978762203 abstract "We use Soft Collinear Effective Theory (SCET) to analyze the transverse momentum broadening, or diffusion in transverse momentum space, of an energetic parton propagating through quark-gluon plasma. Since we neglect the radiation of gluons from the energetic parton, we can only discuss momentum broadening, not parton energy loss. The interaction responsible for momentum broadening in the absence of radiation is that between the energetic (collinear) parton and the Glauber modes of the gluon fields in the medium. We derive the effective Lagrangian for this interaction, and we show that the probability for picking up transverse momentum k_perp is given by the Fourier transform of the expectation value of two transversely separated light-like path-ordered Wilson lines. This yields a field theoretical definition of the jet quenching parameter hat q, and shows that this can be interpreted as a diffusion constant. We close by revisiting the calculation of hat q for the strongly coupled plasma of N=4 SYM theory, showing that previous calculations need some modifications that make them more straightforward and do not change the result." @default.
- W1978762203 created "2016-06-24" @default.
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- W1978762203 date "2010-11-06" @default.
- W1978762203 modified "2023-10-13" @default.
- W1978762203 title "Transverse momentum broadening and the jet quenching parameter, redux" @default.
- W1978762203 hasPublicationYear "2010" @default.
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