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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 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
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
Existing measurements • Assuming • Without external constraints (expected within ±1%) PDG2001 LEP B-Oscillation Group (CDF-RunI not included) Phenomenology Christos Leonidopoulos
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
Experimental methods • untagged data samples: sensitivity ~ • flavor specific: sensitivity ~ • CP eigenstates : sensitivity ~ • CP eigenstate + (50%-even, 50%-odd) Christos Leonidopoulos
…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
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
Expected sensitivity: BTeV Remember: • Notes: • SM gives an upper limit of ~20% for ΔΓS/ΓS • To claim a discovery, we need Christos Leonidopoulos
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
Phenomenology: prospects Alexander Lenz (Regensburg) Christos Leonidopoulos
…Phenomenology: prospects Alexander Lenz (Regensburg) Christos Leonidopoulos
History on ΔΓS Isard Dunietz (Fermilab) Christos Leonidopoulos
…History on ΔΓS Isard Dunietz (Fermilab) Christos Leonidopoulos
Possible scenarios Matin Martin (Oxford) Christos Leonidopoulos
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