Recent FOCUS results on charm mixing and CP violation

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4/17/00

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Table of Contents

PPT Slide

Outline

Mixing Review

Theoretical “guidance”

Mixing Measurements

CLEO enlivened this subject considerably...

Required sensitivity to compete with CLEO

FOCUS has adequate statistics to do this!

FOCUS is well configured for this measurement

PPT Slide

PPT Slide

Segmented target

Proper time resolution

Cerenkov Performance

Skim Strategy with minimal time bias

Fixed target lifetime techniques

Dealing with backgrounds(non-parametrically)

Fitting technique

Obtaining very clean signals

Varying the clean-up cuts

D?KK signal for several cleanups

Monte Carlo Corrections

Time evolutions

Subtracted time evolution

Results

Do lifetimes

Consistency of D* and full sample

Additional checks

Comparisons to CLEO and E791

Phase ambiguity

Search for CP asymmetry in charm decay

Tagging and asymmetry ratios

CP violation search (D?KK) 

Stability of KK results as cuts are varied

CP violation search (D+?KK?)

Stability of KK? results as cuts are varied

CP asymmetry results

Summary

Author: 

Email: Jim Wiss