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SUMMARY:Decoherence of QCD radiation in a quark-gluon plasma
DTSTART;VALUE=DATE-TIME:20120523T090000Z
DTEND;VALUE=DATE-TIME:20120523T103000Z
DTSTAMP;VALUE=DATE-TIME:20130522T072905Z
UID:indico-event-183061@cern.ch
DESCRIPTION:As a first step towards understanding the physics of jet modif
 ications in heavy-ion collisions\, we analyze the radiation off a QCD ante
 nna propagating through a quark-gluon plasma. The resulting spectrum is ch
 aracterized in terms of the hardest scale of the problem. We show that thi
 s scale is either 1) the inverse size of the antenna as probed by the medi
 um or 2) the maximal momentum transfer from the medium\, given by the satu
 ration scale of the QGP. In the former case\, called the ``dipole" regime\
 , the antenna preserves its color correlation during the passage through t
 he QGP and radiates coherently. In the latter situation\, called the ``dec
 oherence" regime\, which applies to the case of a dense medium\, the anten
 na constituents de-cohere rapidly and the resulting spectrum is predominan
 tly the superposition of the independent spectra off the two components. I
 n both cases\, however\, vacuum coherence is restored for gluons emitted w
 ith transverse momenta larger than the hard scale of the associated regime
 . We explore the typical timescales relevant for emissions in both cases a
 nd discuss shortly about the implications for multi-gluon emissions in the
  QGP\, relevant for jet studies in heavy-ion collisions.\nReferences\nY. M
 ehtar-Tani\, C.A. Salgado\, K. Tywoniuk\, PRL 106 (2011) 122002\nY. Mehtar
 -Tani\, C.A. Salgado\, K. Tywoniuk\, PLB 707 (2012) 156\nY. Mehtar-Tani\, 
 C.A. Salgado\, K. Tywoniuk\, arXiv:1102.4317 [hep-ph]\nY. Mehtar-Tani\, C.
 A. Salgado\, K. Tywoniuk\, in preparation\n\nhttp://indico.cern.ch/confere
 nceDisplay.py?confId=183061
LOCATION:CERN 160-1-009
URL:http://indico.cern.ch/conferenceDisplay.py?confId=183061
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