München 2009 – scientific programme
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T: Fachverband Teilchenphysik
T 15: Flavorphysik (Theorie) 2
T 15.9: Talk
Wednesday, March 11, 2009, 18:45–19:00, M001
The golden modes B0 → J/ψ KS,L in the Era of Precision Flavour Physics — Sven Faller1, Robert Fleischer2, •Martin Jung1, and Thomas Mannel1 — 1Universität Siegen, Germany — 2CERN, Switzerland
CP violation is a major challenge of contemporary particle physics. It has been discovered in kaon decays and appears also in B decays, where the B0 → J/ψ KS,L channels are considered to be clean probes of this phenomenon. Recent B-factory data challenge the description of CP violation in the Standard Model of particle physics, showing some “tension” with theoretical predictions. We have a detailed look at certain Standard-Model contributions, which are usually neglected, and point out that they can be included unambiguously through measurements of the B0 → J/ψπ0 observables. Using the most recent data, we show that the tension with the Standard Model is softened, and constrain a possible new-physics phase in B0–B0 mixing.
Our strategy is crucial to fully exploit the accuracy for the search for this kind of new physics at the LHC and future super-flavour factories.