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 timescales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern mediuminduced 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 Lqq 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 timescales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern mediuminduced 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 Lqq 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:
http://lup.lub.lu.se/record/3252205
 author
 MehtarTani, 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
 publisher
 Springer
 external identifiers

 wos:000310851300002
 scopus:84928256097
 ISSN
 11266708
 DOI
 10.1007/JHEP10(2012)197
 language
 English
 LU publication?
 yes
 id
 a04e61a7d2744faeac65e1300614b2be (old id 3252205)
 date added to LUP
 20121227 10:34:48
 date last changed
 20170521 03:19:59
@article{a04e61a7d2744faeac65e1300614b2be, 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 timescales relevant to the decoherence of correlated partons traversing the medium and demonstrate how this relates to the hard scale that govern mediuminduced 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 Lqq 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 = {MehtarTani, Yacine and Salgado, Carlos A. and Tywoniuk, Konrad}, issn = {11266708}, 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}, }