Bs and Bd ? m m- with 2 fb-1

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Bs and Bd ? mm- with 2 fb-1

• S.M. BR 3.510-9
• Many new physics model (e.g.
• SUSY) can enhance BR by 100
• Good mass resolution?
• Can distinguish Bs from Bd?mm
• Using Neural Net to extract signal
• Improve sensitivity by including NN
• output and Mmm in limit calculation

For NNgt0.995 (most sensitive bin) Bs
window ? 3 events Bd window ? 6 events
No significant excess
Br(Bs?mm)lt5.810-8 _at_95 Br(Bd?mm)lt1.810-8 _at_95
Both limits are world best!!!