Kim Vervink EPFL Lausanne Belle collaboration 1 Quark

Kim Vervink EPFL – Lausanne Belle collaboration 1

Quark mixing in the SM. 2

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

2 B-mesons are produced in a boosted frame t is measured from vertex positions à B-mesons are entangled: flavor of B 1 at time t 2 is determined by B 2 decay Different plots 4

2 B-mesons are produced in a boosted frame t is measured from vertex positions à + wrong tagging + detector resolution B-mesons are entangled: flavor of B 1 at time t 2 is determined by B 2 decay Different plots 5

Enormous amount of data from the B-factories! ~ 1. 4 Billion ! b f / 4 6 3 ~1 791/fb (March 25) 557/fb (April 7) 6

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

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

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

Decay rate difference: 10

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

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

background Combined result: 13

New result Extra result: 14

New result 15

New result !! n o i t a ol i v P r. C o 0) f = e A c = n Evide ma from S (4 sig 2. 4 si rom gma f 0 S=A= 16

Preliminary Disentangle CP-odd fraction background 17

B to D*+ D*- Preliminary background 18

B to D*+ D*- Preliminary . 8 3 h t i w n o i t ola i v ce P n C a c i f background signi 19

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