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2010

Antiangular Ordering of Gluon Radiation in QCD Media

Mehtar-Tani, Yacine, Salgado, Carlos A., Tywoniuk, Konrad

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We investigate angular and energy distributions of medium-induced gluon emission off a quark-antiquark antenna in the framework of perturbative QCD as an attempt toward understanding, from first principles, jet evolution inside the quark-gluon plasma.

In-medium color coherence between emitters, neglected in all previous calculations, leads to a novel mechanism of soft-gluon radiation.
The structure of the corresponding spectrum, in contrast with known medium-induced radiation, retains some properties of the vacuum case; in particular, it exhibits a soft divergency.
However, as opposed to the vacuum, the collinear singularity is regulated by the pair opening angle, leading to a strict angular separation between vacuum and medium-induced radiation, denoted as antiangular ordering.

Antiangular Ordering of Gluon Radiation in QCD Media · Around

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