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Kim Vervink EPFL – Lausanne Belle collaboration

Kim Vervink EPFL – Lausanne Belle collaboration. Quark mixing in the SM. Clean measurement possible if no contamination from strong or other weak phases. Negligible other phases. 2 B-mesons are produced in a boosted frame  t is measured from

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Kim Vervink EPFL – Lausanne Belle collaboration

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

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

  10. Decay rate difference:

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

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

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

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