LHC Seminar

# CP violation in charmless two-body B decays at LHCb

## by Stefano Perazzini (INFN Bologna (IT))

Tuesday, 5 November 2013 from to (Europe/Zurich)
at CERN ( 503-1-001 - Council Chamber )
 Description The study of CP violation in charmless charged two-body decays of neutral B mesons provides a test of the Cabibbo-Kobayashi-Maskawa picture of the Standard Model, and is a sensitive probe to contributions of processes beyond it. Using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 1.0 fb-1, collected with the LHCb detector at a centre-of-mass energy of 7 TeV, CP violation has been observed for the first time in the B0_s to K-pi+ decay with a significance of more than 5 sigma. Furthermore, first measurements of direct and mixing-induced CP-violating asymmetries in the B0_s to K+K- decay have been performed, opening new avenues to the determination of the unitarity triangle angle gamma using decays affected by penguin processes. Webcast Please note that this event will be available live via the Webcast Service. Material: Slides Organised by M. Mangano, C. Lourenco, G. Unal......................... **Tea and Coffee will be served at 10h30**