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The radiation pattern of a QCD antenna in a dilute medium

Mehtar-Tani, Yacine; Salgado, Carlos A. and Tywoniuk, Konrad LU (2012) In Journal of High Energy Physics
Abstract
Radiative interferences in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study these effects, we derive the gluon emission spectrum off a color-correlated quark-antiquark pair (antenna) traversing a colored medium to first order in the medium density. The resulting induced gluon distribution is found to be governed by the hardest scale of the problem. In our setup, this can either be the inverse antenna transverse size, r(perpendicular to)(-1), or the scale related to the transverse color correlation length in the medium, which is given by the Debye mass m(D). This emerging scale opens the angular phase... (More)
Radiative interferences in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study these effects, we derive the gluon emission spectrum off a color-correlated quark-antiquark pair (antenna) traversing a colored medium to first order in the medium density. The resulting induced gluon distribution is found to be governed by the hardest scale of the problem. In our setup, this can either be the inverse antenna transverse size, r(perpendicular to)(-1), or the scale related to the transverse color correlation length in the medium, which is given by the Debye mass m(D). This emerging scale opens the angular phase space of emissions off the antenna compared to the vacuum case and gives rise to a typical transverse momentum of the medium-induced emitted gluons, < k(perpendicular to)(2)>(med) similar to max(r(perpendicular to)(-1)m(D)). Above the hard scale interference effects suppress the spectrum resulting in the restoration of vacuum coherence. (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
4
publisher
Springer
external identifiers
  • wos:000304146600064
  • scopus:84860272258
ISSN
1126-6708
DOI
10.1007/JHEP04(2012)064
language
English
LU publication?
yes
id
d9ba6269-f261-4508-86ad-a5416e1d57b1 (old id 2906306)
date added to LUP
2012-07-24 09:20:17
date last changed
2017-08-27 03:06:23
@article{d9ba6269-f261-4508-86ad-a5416e1d57b1,
  abstract     = {Radiative interferences in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study these effects, we derive the gluon emission spectrum off a color-correlated quark-antiquark pair (antenna) traversing a colored medium to first order in the medium density. The resulting induced gluon distribution is found to be governed by the hardest scale of the problem. In our setup, this can either be the inverse antenna transverse size, r(perpendicular to)(-1), or the scale related to the transverse color correlation length in the medium, which is given by the Debye mass m(D). This emerging scale opens the angular phase space of emissions off the antenna compared to the vacuum case and gives rise to a typical transverse momentum of the medium-induced emitted gluons, &lt; k(perpendicular to)(2)&gt;(med) similar to max(r(perpendicular to)(-1)m(D)). Above the hard scale interference effects suppress the spectrum resulting in the restoration of vacuum coherence.},
  author       = {Mehtar-Tani, Yacine and Salgado, Carlos A. and Tywoniuk, Konrad},
  issn         = {1126-6708},
  keyword      = {Jets,Heavy Ion Phenomenology},
  language     = {eng},
  number       = {4},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {The radiation pattern of a QCD antenna in a dilute medium},
  url          = {http://dx.doi.org/10.1007/JHEP04(2012)064},
  year         = {2012},
}