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J. Huston Michigan State University

A short theory introduction to asymmetry in t-tbar production … ongoing work with D. Amidei and T. Schwarz. J. Huston Michigan State University. Top production at the Tevatron. most complete treatment in paper by Kuhn and Rodrigo. effect not present in LO MC’s

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J. Huston Michigan State University

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  1. A short theory introduction to asymmetry in t-tbar production…ongoing work with D. Amidei and T. Schwarz J. Huston Michigan State University

  2. Top production at the Tevatron most complete treatment in paper by Kuhn and Rodrigo effect not present in LO MC’s use MCFM to study at parton level

  3. 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 pT is ttbar pT

  4. Asymmetry

  5. Asymmetry

  6. Dependence on t-tbar pT

  7. pTj > 10 GeV/c

  8. Summary of asymmetries

  9. Scale dependence of asymmetry …either puzzling or profound?

  10. Next steps • More studies cross-checks with MCFM • t-tbar + 1 jet at NLO complete later this summer; useful for looking at high pT 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

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