From Tevatron's top and lepton-based asymmetries to the LHC
  We define a lepton-based asymmetry in semi-leptonic ttbar production at the LHC. We show that the ratio of this lepton-based asymmetry and the ttbar charge asymmetry, measured as a function of the lepton transverse momentum or the ttbar invariant mass is a robust observable in the Standard Model. It is stable against higher order corrections and mis-modeling effects. We show that this ratio can also be a powerful discriminant among different new physics models and between them and the Standard Model. Finally, we show that a related ratio defined at the Tevatron is also robust as a function of the ttbar invariant mass. 
Adrian Carmona, Mikael Chala, Adam Falkowski, Sara Khatibi, Mojtaba   Mohammadi Najafabadi, Gilad Perez, Jose Santiago
hep-ph