This web page summarizes the time dependent measurement of
D^{0}-D^{0}bar
mixing, using approximately 1.5 fb^{-1} of CDF II data.

This analysis is a continuation of the work done for the time independent
measurement of D^{0} &rarr K^{+} &pi ^{-} Wrong
Sign DCS Decays using 0.35 fb-1, where the fits were done with the
assumption of no-mixing. The time independent DCS analysis
was published in
PRD RC 74, 031109
2006

Summary of the charm mixing analysis and results can be found in this public note (PDF).

"Right Sign" refers to the decay chain D^{*} &rarr &pi^{+}
D^{0}, D^{0} &rarr K^{-} &pi^{+},
which results from the Cabibbo Favored decay of D^{0}.

"Wrong Sign" refers to the decay chain D^{*} &rarr &pi^{+}
D^{0}, D^{0} &rarr K^{+} &pi^{-},
which results from Doubly Cabibbo Suppressed decays
and charm mixing.

Plots:

- Ratio WS/RS D* versus proper decay time

EPS, PDF - (Bayesian) probability intervals for the mixing parameters (y', x'
^{2})

EPS, PDF - impact parameter for RS D* (to distinguish D* coming from B decays)

EPS, PDF - Right-sign KPi mass plot (to illustrate D0 signal)

EPS, PDF - Right-sign mass difference plot (to illustrate RS D*)

EPS, PDF - Wrong-sign mass diff plot (to illustrate WS D*)

EPS, PDF

- Best fit for mixing parameters (uncertainties are combined stat. and syst.)
- Rd = (3.04 +/- 0.55) times 10
^{-3} - y' = (8.5 +/- 7.6) times 10
^{-3} - x'
^{2}= (-0.12 +/- 0.35) times 10^{-3} - Fit chi
^{2}= 19.2 for 17 dof

- Rd = (3.04 +/- 0.55) times 10
- Best fit assuming no mixing
- Rd = (4.15 +/- 0.10) times 10
^{-3} - y' = x'
^{2}= 0 - Fit chi
^{2}= 36.8

- Rd = (4.15 +/- 0.10) times 10
- No-mixing probability (Bayesian statistics)

0.015% (equivalent to 3.8 standard deviations) - No-mixing probability (Frequentist p-value)

0.013% (equivalent to 3.8 standard deviations)

Support plots:

- Doubly Cabibbo Suppressed diagram PDF file
- Mixing box diagram PDF file
- Mixing long distance diagram PDF file