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Mass effect and coherence in medium-induced QCD radiation off a q(q)over-bar antenna

Armesto, Nestor; Ma, Hao; Mehtar-Tani, Yacine; Salgado, Carlos A. and Tywoniuk, Konrad LU (2011) In Journal of Physics G: Nuclear and Particle Physics 38(12).
Abstract
The medium-induced one-gluon radiation spectrum off a massive quark-antiquark (q (q) over bar) antenna traversing a colored QCD medium is calculated in this contribution. The gluon spectrum off the antenna computed at first order in the opacity expansion is collinear finite but infrared divergent, which is different from the result obtained from an independent emitter which is both infrared and collinear finite. The interference between emitters dominates the soft gluon radiation when the antenna opening angle is small and the emitted gluon is soft, whereas the antenna behaves like a superposition of independent emitters when the opening angle is large and the radiated gluon is hard. As a phenomenological consequence, we investigate the... (More)
The medium-induced one-gluon radiation spectrum off a massive quark-antiquark (q (q) over bar) antenna traversing a colored QCD medium is calculated in this contribution. The gluon spectrum off the antenna computed at first order in the opacity expansion is collinear finite but infrared divergent, which is different from the result obtained from an independent emitter which is both infrared and collinear finite. The interference between emitters dominates the soft gluon radiation when the antenna opening angle is small and the emitted gluon is soft, whereas the antenna behaves like a superposition of independent emitters when the opening angle is large and the radiated gluon is hard. As a phenomenological consequence, we investigate the energy lost by the projectiles due to the radiation. In general, the size of the mass effects is similar in both cases. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics G: Nuclear and Particle Physics
volume
38
issue
12
publisher
IOP Publishing
external identifiers
  • wos:000304375300140
  • scopus:84055193321
ISSN
0954-3899
DOI
10.1088/0954-3899/38/12/124140
language
English
LU publication?
yes
id
8b0c5bca-aaf5-48b7-bc89-fa883a30d042 (old id 2863472)
date added to LUP
2012-07-24 14:32:25
date last changed
2017-01-01 06:32:52
@article{8b0c5bca-aaf5-48b7-bc89-fa883a30d042,
  abstract     = {The medium-induced one-gluon radiation spectrum off a massive quark-antiquark (q (q) over bar) antenna traversing a colored QCD medium is calculated in this contribution. The gluon spectrum off the antenna computed at first order in the opacity expansion is collinear finite but infrared divergent, which is different from the result obtained from an independent emitter which is both infrared and collinear finite. The interference between emitters dominates the soft gluon radiation when the antenna opening angle is small and the emitted gluon is soft, whereas the antenna behaves like a superposition of independent emitters when the opening angle is large and the radiated gluon is hard. As a phenomenological consequence, we investigate the energy lost by the projectiles due to the radiation. In general, the size of the mass effects is similar in both cases.},
  author       = {Armesto, Nestor and Ma, Hao and Mehtar-Tani, Yacine and Salgado, Carlos A. and Tywoniuk, Konrad},
  issn         = {0954-3899},
  language     = {eng},
  number       = {12},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics G: Nuclear and Particle Physics},
  title        = {Mass effect and coherence in medium-induced QCD radiation off a q(q)over-bar antenna},
  url          = {http://dx.doi.org/10.1088/0954-3899/38/12/124140},
  volume       = {38},
  year         = {2011},
}