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Simulation Issues for Top

Simulation Issues for Top. The precision of all our measurements is limited by the simulation… !. Systematics. An excellent simulation (generators aside) is a necessary condition for studying (and reducing) systematic uncertainties Bites us at all levels: Acceptances & limits

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Simulation Issues for Top

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  1. Simulation Issues for Top • The precision of all our measurements is limited by the simulation… ! Jaco Konigsberg, 8/28/03, Sim. meeting

  2. Systematics • An excellent simulation (generators aside) is a necessary condition for studying (and reducing) systematic uncertainties • Bites us at all levels: • Acceptances & limits • Tails of distributions (i.e. MET in DY) • “Scale factors” galore • Id (isolation) • Etc. Jaco Konigsberg, 8/28/03, Sim. meeting

  3. Mass, for example… • Goal for jet relative response: Simulation Data control of: • Geometry of calorimeters • Single particle response (hadrons, em particles, e/p, non-linearities etc.) • Material - all material ! - • Geant --> Geisha • Min bias [low level radiation response] mult. Int. Jaco Konigsberg, 8/28/03, Sim. meeting

  4. Delta M_top Delta Rel(Data-Sim) Jaco Konigsberg, 8/28/03, Sim. meeting

  5. Another example: B-tagging • Silicon simulation “perfect” or else: • Scale factors with large uncertainties (10-15% right now) • How do we go to the few % level? • Alignments • Charge dep. • Hit resolutions (also COT tracking resolution) • Readout error • Different configuration options - make easy to study Jaco Konigsberg, 8/28/03, Sim. meeting

  6. And another: collision region/triggers • Trigsim as a useful tool • Trigger efficiency dependences in data to be modeled correctly in sim. • High pt e and mu: eta/phi , isolation, dependence • All-hadronic SUMET trigger: model kinematic biases • {x,y,z} vs. time --> DB --> Sim. Jaco Konigsberg, 8/28/03, Sim. meeting

  7. Cont. • Not news but • Who exactly works on it [responsible] and when? • How do we know it is right [or at least it’s status] at any given moment? Jaco Konigsberg, 8/28/03, Sim. meeting

  8. Who/ How • Who exactly works on it? [responsible] and when? • Sim + physics groups… hmmm • Need to get into a positive feedback loop • Fast feedback, both ways, task forces • Need detector experts, per detector, in the sim. Group • The only successes, am I right?, are when this is the case Jaco Konigsberg, 8/28/03, Sim. meeting

  9. transparency • How do we know it’s right at any given moment [and keep it right?] • Figures of merit, per release, agreed upon by the sim & detector & physics groups • Are the tau-id variables in sim. 5.10.n ok? • Two clicks away on the web Jaco Konigsberg, 8/28/03, Sim. meeting

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