The radiation pattern of a QCD antenna in a dense medium
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3252205
- author
- Mehtar-Tani, Yacine ; Salgado, Carlos A. and Tywoniuk, Konrad LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Jets, Heavy Ion Phenomenology
- in
- Journal of High Energy Physics
- issue
- 10
- article number
- 197
- publisher
- Springer
- external identifiers
-
- wos:000310851300002
- scopus:84928256097
- ISSN
- 1029-8479
- DOI
- 10.1007/JHEP10(2012)197
- language
- English
- LU publication?
- yes
- id
- a04e61a7-d274-4fae-ac65-e1300614b2be (old id 3252205)
- date added to LUP
- 2016-04-01 10:50:45
- date last changed
- 2024-04-07 18:21:11
@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).}},
author = {{Mehtar-Tani, Yacine and Salgado, Carlos A. and Tywoniuk, Konrad}},
issn = {{1029-8479}},
keywords = {{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}},
doi = {{10.1007/JHEP10(2012)197}},
year = {{2012}},
}