Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-15
Phys.Rev.Lett.106:122002,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 figures; v2. a number of minor improvements, figures updated, accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.106.122002
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. We comment on the possible consequences of this new contribution for jet observables in heavy-ion collisions.
Mehtar-Tani Yacine
Salgado Carlos A.
Tywoniuk Konrad
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