Rare Decay of the Top t -> cgg in the Standard Model
  We calculate the one-loop flavor changing neutral current top quark decay t -> cgg in the Standard Model. We demonstrate that the rate for t -> cgg exceeds the rate for a single gluon emission t -> cg by about two orders of magnitude, while the rate for t -> cq barq (q=u) is slightly smaller than for t -> cg. 
Gad Eilam (TECHNION), Mariana Frank and Ismail Turan (Concordia   University)