Measurements of Branching Fractions and CP-Violating Asymmetries in B0→π+π-, K+π-, K+K- Decays
Abstract
We present measurements of branching fractions and CP-violating asymmetries for two-body neutral B¯ meson decays to charged pions and kaons based on a sample of about 88×106 ϒ(4S)→BB¯ decays. From a time-independent fit we measure the charge-averaged branching fractions B(B0→π+π- )=(4.7±0.6±0.2)×10-6, B(B0→K+π- )=(17.9±0.9±0.7)×10-6, and the direct CP-violating charge asymmetry AKπ=-0.102±0.050±0.016 [-0.188,-0.016], where the ranges in square brackets indicate the 90% confidence intervals. From a time-dependent fit we measure the B0→π+π- CP-violating parameters Sππ=0.02±0.34±0.05 [-0.54,+0.58] and Cππ=-0.30±0.25±0.04 [-0.72,+0.12].
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2002
- DOI:
- 10.1103/PhysRevLett.89.281802
- arXiv:
- arXiv:hep-ex/0207055
- Bibcode:
- 2002PhRvL..89B1802A
- Keywords:
-
- 13.25.Hw;
- 11.30.Er;
- 12.15.Hh;
- Decays of bottom mesons;
- Charge conjugation parity time reversal and other discrete symmetries;
- Determination of Kobayashi-Maskawa matrix elements;
- High Energy Physics - Experiment
- E-Print:
- 7 pages, 2 postscript figues, submitted to PRL