Abstract
We consider the interference pattern for the medium-induced gluon radiation produced by a color singlet quark–antiquark antenna embedded in a QCD medium with size L and ‘jet-quenching’ parameter . Within the BDMPS-Z regime, we demonstrate that, for a dipole opening angle , the interference between the medium-induced gluon emissions by the quark and the antiquark is suppressed with respect to the direct emissions. This is so since direct emissions are delocalized throughout the medium and thus yield contributions proportional to L while interference occurs only between emissions at early times, when both sources remain coherent. Thus, for , the medium-induced radiation is the sum of the two spectra individually produced by the quark and the antiquark, without coherence effects like angular ordering. For , the medium-induced radiation vanishes.
Highlights
One of the most spectacular observations of the LHC heavy ion program is the strong modification of jets in a dense QCD medium [1, 2]
Most theoretical descriptions of this modification have focussed on the characterization of the medium–induced gluon radiation off a single parton propagating through the plasma
The emission process preserves the quantum coherence of the qqsystem so long as the virtual gluon overlaps with both sources during formation
Summary
One of the most spectacular observations of the LHC heavy ion program is the strong modification of jets in a dense QCD medium [1, 2]. The interference phenomena require the two partonic sources to be coherent with each other during the gluon formation. The emission process preserves the quantum coherence of the qqsystem so long as the virtual gluon overlaps with both sources during formation.
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