Abstract
We investigate the color coherence pattern between initial and final state radiation in the presence of a QCD medium. We derive the medium-induced gluon spectrum of an “asymptotic” parton which suffers a hard scattering and subsequently crosses the medium. The angular distribution of the induced gluon spectrum is modified when one includes interference terms between the incoming and the outgoing parton at finite angle between them. The coherent, incoherent and soft limits of the medium-induced gluon spectrum are studied. In the soft limit, we provide a simple and intuitive probabilistic picture which could be of interest for Monte Carlo implementations. The configuration studied here may have phenomenological consequences in high-energy nuclear collisions.
Highlights
INTRODUCTIONThe medium induces a partial decoherence of the qqantenna which opens the phase space for QCD radiation at large angles, a property which was called anti-angular ordering [12] in the soft limit
Coherence of soft gluon radiation is one of the most important and remarkable properties of perturbative QCD
We derive an analytic expression for the medium-induced gluon spectrum of an asymptotic parton created in the remote past which suffers a hard collision and subsequently crosses a QCD medium
Summary
The medium induces a partial decoherence of the qqantenna which opens the phase space for QCD radiation at large angles, a property which was called anti-angular ordering [12] in the soft limit. This decoherence is total for a dense medium in which the quark and the antiquark emit independently, even forgetting about their original color configuration being an octet or a singlet.
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