Using pp collision data corresponding to an integrated luminosity of 1.0fb-1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in Bs0→K-π+ decays, ACP(Bs0→K-π+)=0.27±0.04(stat)±0.01(syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of Bs0 mesons. Furthermore, we provide an improved determination of direct CP violation in B0→K+π- decays, ACP(B0→K+π-)=-0.080±0.007(stat)±0.003(syst), which is the most precise measurement of this quantity to date.
Physical Review Letters
- Pub Date:
- May 2013
- Charge conjugation parity time reversal and other discrete symmetries;
- Decays of bottom mesons;
- High Energy Physics - Experiment
- 9 pages, 2 figures, 1 table, second version with slight changes after journal review