1. Kim Vervink EPFL – Lausanne Belle collaboration

2. Quark mixing in the SM.

3. Clean measurement possible if no contamination from strong or other
weak phases
Negligible other phases

4. 2 B-mesons are produced in a boosted frame
t is measured from
vertex
positions
B-mesons are entangled: flavor of B1 at time t2 is determined by B2 decay
Different plots

5. 2 B-mesons are produced in a boosted frame
t is measured from
vertex
positions
+ wrong tagging
+ detector resolution
B-mesons are entangled: flavor of B1 at time t2 is determined by B2 decay
Different plots

6. Enormous amount of data from the B-factories!
~ 1.4 Billion
791/fb (March 25)
~ 1364/fb !
557/fb (April 7)

7. Putting all the results together.
It is sin2f which currently constraints the allowed region the most.
The picture corresponds remarkably well with the SM predictions. 1
As we measure sin2f, there is a
p-2f vs 2f ambiguity. 1 1 1

8. Increasing sensitivity to New Physics Decreasing tree amplitude
NEW NEW NEW
No results on b  s penguin decays

9. CP even
CP odd
CP even
CP odd
CP even + CP odd result:

10. Decay rate difference:

11. First three-dimensional analysis
CP-odd fraction
Input for the next analysis…

12. Background subtracted
“golden modes”
~12600 sig. ev.
~14000 sig. ev.
CP odd
background
Background subtracted
CP even
background
CP even + CP odd result:

13. background
Combined
result:

14. New result
Extra result:

15. New result

16. Evidence for CP violation !! (4 sigma from S=A=0)
New result
Evidence for CP violation !!
(4 sigma from S=A=0)
2.4 sigma from S=A=0

17. Preliminary
Disentangle CP-odd fraction
background
background

18. B to D*+ D*-
Preliminary
background

19. CP violation with 3.8 significance
B to D*+ D*-
Preliminary
CP violation with 3.8
significance
background

23. Summary CP violation was measured in many different B decays
The results presented have an excellent agreement with Standard Model