Orateur
Till Moritz Karbach
(TU Dortmund)
Description
Three recent results from the LHCb experiment on direct CP violation in the B and Bs systems are presented.
1) A study of B± → J/ψπ± and B± → ψ(2S)π± decays was performed with data corresponding to 0.35 fb−1 of proton-proton collisions at √s = 7 TeV. No evidence of direct CP violation is seen.
2) Using the same data sample, also the K±π∓ final state is analysed. First evidence of CP violation in the decays of Bs0 mesons to K±π∓ pairs is reported: ACP (Bs0 → Kπ) = 0.27 ± 0.08 (stat) ± 0.02 (syst), with a significance of 3.3σ.
3) On the full 2011 dataset of 1fb-1, the decays B± → DK± and B± → Dπ± were analyzed, where the D is reconstructed in the two-body final states: KK, Kπ and ππ. Measurements of several observables are made, that bear significance to a measurement of CKM angle gamma. This includes the first observation of the suppressed mode: B± → [π±K∓]DK±. In a combined fit to all the modes DK± considered, CP -violation is observed with a significance of 5.8σ.
Summary
Three recent results from the LHCb experiment on direct CP violation in the B and Bs systems are presented.
Auteur principal
Till Moritz Karbach
(TU Dortmund)
