Kim Vervink EPFL – Lausanne Belle collaboration

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Presentation transcript:

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 vertex positions B-mesons are entangled: flavor of B1 at time t2 is determined by B2 decay Different plots

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

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

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

CP even CP odd CP even CP odd CP even + CP odd result:

Decay rate difference:

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

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

background Combined result:

New result Extra result:

New result

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

Preliminary Disentangle CP-odd fraction background background

B to D*+ D*- Preliminary background

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

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