Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-06-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 figures; Proceedings of the "Quark Matter 2011" conference
Scientific paper
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 $\hat q$. Within the BDMPS-Z regime, we demonstrate that, for a dipole opening angle $\theta_{q\bar q} \gg\theta_c\equiv {2}/{\sqrt{\hat q L^3}}$, 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 $\tqq \gg\theta_c$, 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 $\tqq \ll\theta_c$, the medium--induced radiation vanishes.
Casalderrey-Solana Jorge
Iancu Edmond
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