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measurements – Part II

measurements – Part II. Christos Leonidopoulos Columbia/D Ø -“Snowmass Studies” July 2, 2001. limiting theoretical & experimental errors expected sensitivity from CDF, D0, BTeV, ATLAS, CMS, LHCb prospects for error improvement SM vs. other model predictions.

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measurements – Part II

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  1. measurements – Part II Christos Leonidopoulos Columbia/DØ -“Snowmass Studies” July 2, 2001 • limiting theoretical & experimental errors • expected sensitivity from • CDF, D0, BTeV, ATLAS, CMS, LHCb • prospects for error improvement • SM vs. other model predictions

  2. Phenomenology: SM predictions • Accuracy limited by lattice data for operator product /QCD heavy product expansion http://www-theory.fnal.gov/people/ligeti/Brun2/sept/nierste.pdf quenched lattice QCD http://cern.ch/nierste/uli.ps QCD-NLO http://www-theory.fnal.gov/people/nierste/wg3documents/cern.breport.ps.gz Christos Leonidopoulos

  3. Existing measurements • Assuming • Without external constraints (expected within ±1%) PDG2001 LEP B-Oscillation Group (CDF-RunI not included) Phenomenology Christos Leonidopoulos

  4. Phenomenology: beyond the SM • SM : CP violation in BS mixing small • New physics: large CP violation; affects only ΔΓS CPV phase in mixing (φSM ~ 0) determine CPV phase Christos Leonidopoulos

  5. Experimental methods • untagged data samples: sensitivity ~ • flavor specific: sensitivity ~ • CP eigenstates : sensitivity ~ • CP eigenstate + (50%-even, 50%-odd) Christos Leonidopoulos

  6. …Experimental methods • CP eigenstate + (50%-even, 50%-odd) easy trigger! • admixture of CP-even and CP-odd states • the ΔΓS error depends on the admixture CDF-RunI: (73 ± 19) % CP-even Christos Leonidopoulos

  7. CDF-RunI: (73 ± 19) % even Expected sensitivity: CDF-RunII projected #’s RunI to RunII (MC: optimistic) • Notes: • SM gives an upper limit of ~20% for ΔΓS/ΓS • To claim a discovery, we need   Christos Leonidopoulos

  8. Expected sensitivity: BTeV Remember: • Notes: • SM gives an upper limit of ~20% for ΔΓS/ΓS • To claim a discovery, we need   Christos Leonidopoulos

  9. Expected sensitivity: LHC ATLAS, CMS, LHCb: Remember: • Notes: • SM gives an upper limit of ~20% for ΔΓS/ΓS • To claim a discovery, we need   Christos Leonidopoulos

  10. Phenomenology: prospects Alexander Lenz (Regensburg) Christos Leonidopoulos

  11. …Phenomenology: prospects Alexander Lenz (Regensburg) Christos Leonidopoulos

  12. History on ΔΓS Isard Dunietz (Fermilab) Christos Leonidopoulos

  13. …History on ΔΓS Isard Dunietz (Fermilab) Christos Leonidopoulos

  14. Possible scenarios Matin Martin (Oxford) Christos Leonidopoulos

  15. Expected sensitivities: References • http://mit2.fnal.gov/~paus/bw1999/MEETINGS/000217-delta-gamma.ps • http://www-theory.fnal.gov/people/nierste/second_ws_talks/martin.ps.gz • http://www-theory.fnal.gov/people/nierste/second_ws_talks/cheung.ps.gz • http://home.fnal.gov/~cheung/Public/run2/btev_deltag.ps.gz • http://home.fnal.gov/~cheung/Public/run2/main.ps.gz • http://mit.fnal.gov/~paus/TMP/Breport/main.ps • http://cern.ch/nierste/uli.ps • hep-ph/0003238 Christos Leonidopoulos

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