1. J. Huston lepton + jets 7/15/05 A short theory introduction to asymmetry in t-tbar production … ongoing work with D. Amidei and T. Schwarz J. Huston Michigan State University

2. J. Huston lepton + jets 7/15/05 Top production at the Tevatron effect not present in LO MC’s use MCFM to study at parton level most complete treatment in paper by Kuhn and Rodrigo

3. J. Huston lepton + jets 7/15/05 Properties of t-tbar events All MCFM plots will show the cross section in fb MCFM final state consists of a t, a tbar and (maybe) 1 gluon @NLO jet p T is ttbar p T

4. J. Huston lepton + jets 7/15/05 Asymmetry

5. J. Huston lepton + jets 7/15/05 Asymmetry

6. J. Huston lepton + jets 7/15/05 Dependence on t-tbar p T

7. J. Huston lepton + jets 7/15/05 p T j > 10 GeV/c

8. J. Huston lepton + jets 7/15/05 Summary of asymmetries

9. J. Huston lepton + jets 7/15/05 Scale dependence of asymmetry …either puzzling or profound?

10. J. Huston lepton + jets 7/15/05 Next steps More studies cross-checks with MCFM  t-tbar + 1 jet at NLO complete later this summer; useful for looking at high p T asymmetry  synergy with ttbar + jet study  I’ve been talking with the authors Continue studies with MC@NLO samples  effects of soft gluon radiation on asymmetry  ability to tag hard/soft t-tbar production  feedback for optimizing analysis procedure/cuts on the data