Using the latest LHCb measurements of time-dependent CP violation in the B0s→K+K- decay, a U-spin relation between the decay amplitudes of B0s→K+K- and B0→π+π-decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B0s mixing phase -2βs. Results from an extended approach, which uses additional inputs on B0→π0π0and B+→π+π0decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5+7.2-6.7)° modulo 180° is determined. In an alternative analysis, the value -2βs=-0.12+0.14-0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.
|Number of pages||11|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Early online date||9 Dec 2014|
|Publication status||Published - 4 Feb 2015|
ASJC Scopus subject areas
- Nuclear and High Energy Physics