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Interference effects in medium-induced gluon radiation
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As a step towards understanding the in-medium evolution of a hard jet, 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. We focus on the typical kinematics for medium-induced gluon radiation in the BDMPS-Z regime, that is, short formation times \tau_f << L and relatively large emission angles \theta >>\theta_c = 2/\sqrt{\hat q L^3}, with \hat q the `jet quenching' parameter. We demonstrate that, for a dipole opening angle \theta_{q\bar q} larger than \theta_c, the interference between the medium-induced gluon emissions by the quark and the antiquark is parametrically suppressed with respect to the corresponding direct emissions. Physically, this is so since the direct emissions can be delocalized anywhere throughout the medium and thus yield contributions proportional to L. On the contrary, the interference occurs only between gluons emitted at very early times, within the characteristic time scales for quantum and color coherence between the two emitters, which in this regime are much smaller than L. This implies that, for \theta_{q\bar q} >> \theta_c, the medium-induced radiation by the dipole is simply the sum of the two BDMPS-Z spectra individually produced by the quark and the antiquark, without coherence effects like angular ordering. For \theta_{q\bar q} << \theta_c, the BDMPS-Z radiation by the dipole vanishes.
Forward citations
Cited by 13 Pith papers
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Gluon radiation from a QCD antenna with realistic parton-medium interactions
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Open quantum system approach to the transverse momentum broadening of a colour dipole
Derives Lindblad evolution for color dipole in QCD plasma and demonstrates quasi-factorization of Wigner distribution violated by color decoherence factor controlled by theta_qqbar/theta_c ratio.
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Simple Scaling Laws for Energy Correlators in Nuclear Matter
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A quark-antiquark antenna's medium-induced gluon spectrum is computed numerically for a Yukawa scattering rate, generalizing the earlier single-quark method.
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