Jet Activity in t-tbar Events and Top Mass Reconstruction at Hadron   Colliders
  We analyse the impact of matrix-element corrections to top decays in HERWIG on several observables related to the jet activity in t-tbar events at the Tevatron and at the LHC. In particular, we study the effects induced by the higher-order corrections to top decays on the top mass reconstruction using the recently proposed J/psi+lepton final states. 
G. Corcella, M.L. Mangano and M.H. Seymour