Antiangular Ordering of Gluon Radiation in QCD Media
Abstract
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.
Keywords
Cite
@article{arxiv.1009.2965,
title = {Antiangular Ordering of Gluon Radiation in QCD Media},
author = {Yacine Mehtar-Tani and Carlos A. Salgado and Konrad Tywoniuk},
journal= {arXiv preprint arXiv:1009.2965},
year = {2011}
}
Comments
4 pages, 2 figures; v2. a number of minor improvements, figures updated, accepted for publication in PRL