Hunting Penguins: Towards high precision CP violation measurements in the B meson systems

par Kristof De Bruyn (NIKHEF)

lundi 16 mars 2015, 14:00 → 15:00 Europe/Paris

Amphithéâtre (CPPM)

Although the first run of the Large Hadron Collider has been a great success, we have yet to see a clear signal from physics beyond the Standard Model. In the flavour sector large deviations have now been ruled out, and we thus need to prepare ourselves to deal with smallish new physics effects. As the forthcoming physics runs at the LHC and KEK super B factory promise to reduce the experimental uncertainties even further, this implies that we need to have a critical look at the theoretical assumptions underlying the experimental analyses. For the determination of the B-Bbar mixing phases phid and phis from CP violation measurements in Bd->JpsiKS and Bs->JpsiPhi, respectively, this implies that controlling higher order hadronic corrections to the CP observables, originating from so-called penguin topologies, becomes mandatory. Relying on approximate flavour symmetries, the size of these difficult to calculate penguin contributions can be determined directly from the data. The decay modes that play a key role in this strategy are Bs->JpsiKS, Bd->JpsiRho and Bs->JpsiKstar. In this talk I will discuss the current constraints on the penguin parameters, and sketch a roadmap to control the penguins in the future.

Slides Roadmap_Marseille.pdf