Observation of B --> eta' K* and Evidence for B --> eta' rho+

الأصل · EN

We present an observation of B→η′ K*. The data sample corresponds to 232 million BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the branching fractions (in units of 10⁻⁶) B(B⁰→η′ K*⁰) = 3.8±1.1±0.5 and B(B+→η′ K*⁺) = 4.9⁺¹.⁹₋₁.₇±0.8, where the first error is statistical and the second systematic. A simultaneous fit results in the observation of B→η′ K* with B(B→η′ K*) = 4.1₋₀.₉⁺¹.⁰ ± 0.5. We also search for B→η′ ρ and B→η′ f₀(980)(f₀ → π+π-) with results and 90% confidence level upper limits B(B+→η′ ρ+) = 8.7⁺³.¹₋₂.₈ ⁺².³₋₁.₃ (<14), B(B⁰→η′ ρ⁰) < 3.7 and B(B⁰→η′ f₀(980)(f₀→π+π-)) < 1.5. Charge asymmetries in the channels with significant yields are consistent with zero.