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The radiation pattern of a QCD antenna in a dense medium

Mehtar-Tani, Yacine; Salgado, Carlos A. and Tywoniuk, Konrad LU (2012) In Journal of High Energy Physics
Abstract
We calculate the radiation spectrum off a q (q) over bar pair of a fixed opening angle theta(q (q) over bar) traversing a medium of length L. Multiple interactions with the medium are handled in the harmonic oscillator approximation, valid for soft gluon emissions. We discuss the time-scales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern medium-induced radiation. For large angle radiation, the hard scale is given by Q(hard) = max(r(perpendicular to)(-1), Q(s)), where r(perpendicular to) = theta L-qq is the probed transverse size and Q(s) is the maximal transverse momentum accumulated by the emitted gluon in the medium. These situations define in turn... (More)
We calculate the radiation spectrum off a q (q) over bar pair of a fixed opening angle theta(q (q) over bar) traversing a medium of length L. Multiple interactions with the medium are handled in the harmonic oscillator approximation, valid for soft gluon emissions. We discuss the time-scales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern medium-induced radiation. For large angle radiation, the hard scale is given by Q(hard) = max(r(perpendicular to)(-1), Q(s)), where r(perpendicular to) = theta L-qq is the probed transverse size and Q(s) is the maximal transverse momentum accumulated by the emitted gluon in the medium. These situations define in turn two distinct regimes, which we call "dipole" and "decoherence" regimes, respectively, which are discussed in detail. A feature common to both cases is that coherence of the radiation is restored at large transverse momenta, k(perpendicular to) > Q(hard). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Jets, Heavy Ion Phenomenology
in
Journal of High Energy Physics
issue
10
publisher
Springer
external identifiers
  • wos:000310851300002
  • scopus:84928256097
ISSN
1126-6708
DOI
10.1007/JHEP10(2012)197
language
English
LU publication?
yes
id
a04e61a7-d274-4fae-ac65-e1300614b2be (old id 3252205)
date added to LUP
2012-12-27 10:34:48
date last changed
2017-05-21 03:19:59
@article{a04e61a7-d274-4fae-ac65-e1300614b2be,
  abstract     = {We calculate the radiation spectrum off a q (q) over bar pair of a fixed opening angle theta(q (q) over bar) traversing a medium of length L. Multiple interactions with the medium are handled in the harmonic oscillator approximation, valid for soft gluon emissions. We discuss the time-scales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern medium-induced radiation. For large angle radiation, the hard scale is given by Q(hard) = max(r(perpendicular to)(-1), Q(s)), where r(perpendicular to) = theta L-qq is the probed transverse size and Q(s) is the maximal transverse momentum accumulated by the emitted gluon in the medium. These situations define in turn two distinct regimes, which we call "dipole" and "decoherence" regimes, respectively, which are discussed in detail. A feature common to both cases is that coherence of the radiation is restored at large transverse momenta, k(perpendicular to) > Q(hard).},
  articleno    = {197},
  author       = {Mehtar-Tani, Yacine and Salgado, Carlos A. and Tywoniuk, Konrad},
  issn         = {1126-6708},
  keyword      = {Jets,Heavy Ion Phenomenology},
  language     = {eng},
  number       = {10},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {The radiation pattern of a QCD antenna in a dense medium},
  url          = {http://dx.doi.org/10.1007/JHEP10(2012)197},
  year         = {2012},
}