We present measurements of branching fractions and CP-violating asymmetries for two-body neutral B̅ meson decays to charged pions and kaons based on a sample of about 88×106 ^ϒ(4S)→BB̅ 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].
Measurements of Branching Fractions and CP-Violating Asymmetries in B0→π+π-, K+π-, K+K- Decays
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;SIMI, GABRIELE;
2002
Abstract
We present measurements of branching fractions and CP-violating asymmetries for two-body neutral B̅ meson decays to charged pions and kaons based on a sample of about 88×106 ^ϒ(4S)→BB̅ 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].Pubblicazioni consigliate
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