Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 4 figures
Scientific paper
We study the radiation pattern of a highly energetic partonic antenna in a colored state traversing a dense QCD medium. Resumming multiple scatterings of all involved constituents with the medium we derive the general gluon spectrum which encompasses both longitudinal color coherence between scattering centers in the medium, responsible for the well known Landau-Pomeranchuk-Migdal (LPM) effect, and transverse color coherence between partons inside a jet, leading, in vacuum, to angular ordering of the parton shower. We identify the relevant scales of the problem and show the emergence of an extended window where transverse coherence is at work for dense media leading to gradual decoherence of the antenna. This naturally restricts the regime of incoherent medium-induced radiation to small-angles (in-cone) and high gluon energies. It follows that in the totally opaque limit the partons {\it decohere} and radiate independently {\it as if} in vacuum.
Mehtar-Tani Yacine
Tywoniuk Konrad
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