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Antiangular ordering of gluon radiation in QCD media.
- Source :
-
Physical review letters [Phys Rev Lett] 2011 Mar 25; Vol. 106 (12), pp. 122002. Date of Electronic Publication: 2011 Mar 23. - Publication Year :
- 2011
-
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, i.e., off a single emitter, retains some properties of the vacuum case; in particular, it exhibits a soft divergence. 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.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 106
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 21517305
- Full Text :
- https://doi.org/10.1103/PhysRevLett.106.122002