Measurement of Branching Fractions and Charge Asymmetries in B~+ Decays to ηπ~+, ηK~+, ηρ~+, and η′π~+, and Search for B~0 Decays to ηK~0 and ηω

摘要

We present measurements of branching fractions and charge asymmetries for six B-meson decay modes with an η or η′ meson in the final state. The data sample corresponds to 232 x 10~6 BB pairs collected with the BABAR detector at the PEP-Ⅱ asymmetric-energy e~+e~- B Factory at SLAC. We measure the branching fractions (in units of 10~(-6)): B(B~+ → ηπ~+) = 5.1 ± 0.6 ± 0.3, B(B~+ → ηK~+) = 3.3 ± 0.6 ± 0.3, B(B~0 → ηK~0) = 1.5 ± 0.7 ± 0.1 ( < 2.5 at 90% C.L.), B(B~+ → ηρ~+) = 8.4 ± 1.9 ± 1.1, B(B~0 → ηω) = 1.0 ± 0.5 ± 0.2 ( < 1.9 at 90% C.L.), and B(B~+ → η′π~+) = 4.0 ± 0.8 ± 0.4, where the first uncertainty is statistical and second systematic. For the charged modes we also determine the charge asymmetries, all found to be compatible with zero.