Mass effect and coherence in medium-induced QCD radiation off a q(q)over-bar antenna

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The medium-induced one-gluon radiation spectrum off a massive quark-antiquark (q (q) over bar) antenna traversing a colored QCD medium is calculated in this contribution. The gluon spectrum off the antenna computed at first order in the opacity expansion is collinear finite but infrared divergent, which is different from the result obtained from an independent emitter which is both infrared and collinear finite. The interference between emitters dominates the soft gluon radiation when the antenna opening angle is small and the emitted gluon is soft, whereas the antenna behaves like a superposition of independent emitters when the opening angle is large and the radiated gluon is hard. As a phenomenological consequence, we investigate the energy lost by the projectiles due to the radiation. In general, the size of the mass effects is similar in both cases.


  • Nestor Armesto
  • Hao Ma
  • Yacine Mehtar-Tani
  • Carlos A. Salgado
  • Konrad Tywoniuk
Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
TidskriftJournal of Physics G: Nuclear and Particle Physics
Utgåva nummer12
StatusPublished - 2011
Peer review utfördJa