Further ways to distinguish single-lepton top quark signals from   background at the Tevatron
  Further kinematical variables are suggested, in which to compare the putative leptonic $W$ plus 4-jet top quark signal with the QCD background. We show that the lepton rapidity asymmetry, the $p_T$-ranking of the tagged $b$-jet, the double-tag probability, the reconstructed $t+\bar t$ invariant mass, and the lepton energy in the parent top quark rest-frame, all display interesting differences between signal and background. 
V.Barger, E.Mirkes, J.Ohnemus and R.J.N.Phillips