Measurements of Branching Fractions and CP-Violating Asymmetries in B0π+π, K+π, K+K Decays

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. Lett. 89, 281802 – Published 31 December 2002

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(B0π+π)=(4.7±0.6±0.2)×106, B(B0K+π)=(17.9±0.9±0.7)×106, 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 B0π+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].

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  • Received 23 July 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.281802

©2002 American Physical Society

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Vol. 89, Iss. 28 — 31 December 2002

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