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University of Florida, Gainesville, FL 32611, USA.
Phys Rev Lett. 2005 Jul 15;95(3):031801. doi: 10.1103/PhysRevLett.95.031801.
We present the first evidence of charmless decays of the B(0)(s) meson, the decay B(0)(s)--> phiphi, and a measurement of the branching ratio BR(B(0)(s)--> phiphi) using 180 pb(-1) of data collected by the CDF II experiment at the Fermilab Tevatron collider. In addition, the BR and direct CP asymmetry for the B+-->phiK+ decay are measured. We obtain BR(B(0)(s)--> phiphi)=[14(+6)(-5)(stat)+/-6(syst)] x 10(-6), BR(B+-->phiK+)=[7.6+/-1.3(stat)+/-0.6(syst)] x 10(-6), and A(CP)(B+-->phiK+)= -0.07+/-0.17(stat)+0.03 / -0.02(syst). Both decays are governed in the standard model by second order (penguin) b-->s(-)ss amplitudes.
我们展示了B⁰ₛ介子无 charm 衰变的首个证据，即衰变B⁰ₛ→φφ，并利用费米实验室Tevatron对撞机上CDF II实验收集的180 pb⁻¹数据测量了分支比BR(B⁰ₛ→φφ)。此外，还测量了B⁺→φK⁺衰变的分支比和直接CP不对称性。我们得到BR(B⁰ₛ→φφ)=[14(⁺⁶)(₋₅)(统计)+/₋6(系统)]×10⁻⁶，BR(B⁺→φK⁺)=[7.6+/₋1.3(统计)+/₋0.6(系统)]×10⁻⁶，以及A(CP)(B⁺→φK⁺)= -0.07+/₋0.17(统计)+0.03 / ₋0.02(系统)。在标准模型中，这两种衰变均由二阶（企鹅）b→s⁻ss振幅控制。
