measurements Part II

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

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Phenomenology SM predictions

• Accuracy limited by lattice data for

operator product /QCD heavy product expansion
http//www-theory.fnal.gov/people/ligeti/Brun2/sep
t/nierste.pdf
quenched lattice QCD
http//cern.ch/nierste/uli.ps
QCD-NLO
http//www-theory.fnal.gov/people/nierste/wg3docum
ents/cern.breport.ps.gz
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Existing measurements

• Assuming
• Without external constraints

(expected within 1)
PDG2001
LEP B-Oscillation Group (CDF-RunI not included)
Phenomenology
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Phenomenology beyond the SM

• SM CP violation in BS mixing small
• New physics large CP violation affects only ?GS

CPV phase in mixing (fSM 0)
determine CPV phase
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Experimental methods

• untagged data samples sensitivity
• flavor specific sensitivity
• CP eigenstates sensitivity
• CP eigenstate (50-even, 50-odd)

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Experimental methods

• CP eigenstate (50-even, 50-odd)

easy trigger!

• admixture of CP-even and CP-odd states
• the ?GS error depends on the admixture

CDF-RunI (73 19) CP-even
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Expected sensitivity CDF-RunII
projected s RunI to RunII (MC optimistic)

• Notes
• SM gives an upper limit of 20 for ?GS/GS
• To claim a discovery, we need ? ??

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Expected sensitivity BTeV
Remember

• Notes
• SM gives an upper limit of 20 for ?GS/GS
• To claim a discovery, we need ? ??

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Expected sensitivity LHC
ATLAS, CMS, LHCb
Remember

• Notes
• SM gives an upper limit of 20 for ?GS/GS
• To claim a discovery, we need ? ??

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Phenomenology prospects
Alexander Lenz (Regensburg)
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Phenomenology prospects
Alexander Lenz (Regensburg)
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History on ?GS
Isard Dunietz (Fermilab)
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History on ?GS
Isard Dunietz (Fermilab)
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Possible scenarios
Matin Martin (Oxford)
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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_del
  tag.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