CHARMLESS QUASI-TWO-BODY MODES AT BABAR

摘要

We present results for measurements of B~0 meson decays to charmless final states ηK~0, ηω, a_1~+(1260)π~- with a_1~+(1260) → π~+π~+π~-, ρ~0K_S~0, K_S~0K_S~0K_S~0, and of B~+ to ηρ~+ and η′π~+. Analyses are based on data taken with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the following branching fractions in units of 10~(-6): B(B~0 → ηω) = 1.2 ± 0.6 ± 0.2 (< 2.1, 90%C.L.), B(B~0 → ηK~0) = 2.5±0.8±0.1, B(B~+ → ηρ~+) = 8.6±2.2± 1.1, B(B~+ →η′π~+) = 4.2 ± 1.0 ± 0.5, B(B~0 → a_1~+(1260)π~-) = 42.6 ± 4.2 ± 4.1, B(B~0 → ρ~0K~0) = 5.1 ± 1.0 ± 1.2, and B(B~0 → K_S~0K_S~0K_S~0) = 6.5±0.8±0.8. The charge asymmetries are A_(ch)(B(B~+ → ηρ~+)) = (7±19±2)% and A_(ch)(B(B~+ → η′π~+)) = (24±19±1)%. First error is statistical, the second systematic. All results are preliminary.