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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2003 Aug 15;91(7):071801. doi: 10.1103/PhysRevLett.91.071801. Epub 2003 Aug 13.
We report a study of the B meson decays, B+ --> J/psiphiK+, B0 --> J/psiphiK(0)(S), B0 --> J/psiphi, B0 --> J/psieta, and B0 --> J/psieta' using 56 x 10(6) B(-)B events collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II e(+)e(-) asymmetric-energy storage ring. We measure the branching fractions B(B+ --> J/psiphiK+)=(4.4+/-1.4(stat)+/-0.5(syst))x 10(-5) and B(B0 --> J/psiphiK(0)(S))=(5.1+/-1.9(stat)+/-0.5(syst))x 10(-5), and set upper limits at 90% confidence level for the branching fractions B(B0 --> J/psiphi)<9.2 x 10(-6), B(B0 --> J/psieta)<2.7 x 10(-5), and B(B0 --> J/psieta')<6.3 x 10(-5).
我们报告了一项关于B介子衰变的研究，即使用在PEP-II正负电子非对称能量储存环上的BABAR探测器，在Upsilon(4S)共振处收集的56×10⁶个B⁻B事件，研究B⁺→J/ψφK⁺、B⁰→J/ψφK⁰(S)、B⁰→J/ψφ、B⁰→J/ψη和B⁰→J/ψη'。我们测量了分支比B(B⁺→J/ψφK⁺)=(4.4±1.4(统计)±0.5(系统))×10⁻⁵和B(B⁰→J/ψφK⁰(S))=(5.1±1.9(统计)±0.5(系统))×10⁻⁵，并在90%置信水平下对分支比B(B⁰→J/ψφ)<9.2×10⁻⁶、B(B⁰→J/ψη)<2.7×10⁻⁵和B(B⁰→J/ψη')<6.3×10⁻⁵设置了上限。
