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Institute of Physics, Academia Sinica, Taipei, Tawan, Republic of China.
Phys Rev Lett. 2008 Mar 28;100(12):121803. doi: 10.1103/PhysRevLett.100.121803. Epub 2008 Mar 27.
We measure the mean lifetime tau=2/(Gamma_{L}+Gamma_{H}) and the decay-width difference DeltaGamma=Gamma_{L}-Gamma_{H} of the light and heavy mass eigenstates of the B_{s}{0} meson, B_{sL}{0} and B_{sH}{0}, in B_{s}{0}-->J/psivarphi decays using 1.7 fb;{-1} of data collected with the CDF II detector at the Fermilab Tevatron pp[over ] collider. Assuming CP conservation, a good approximation for the B_{s}{0} system in the standard model, we obtain DeltaGamma=0.076_{-0.063}{+0.059}(stat)+/-0.006(syst) ps{-1} and tau=1.52+/-0.04(stat)+/-0.02(syst) ps, the most precise measurements to date. Our constraints on the weak phase and DeltaGamma are consistent with CP conservation.
我们利用费米实验室Tevatron质子-质子对撞机上的CDF II探测器收集的1.7 fb⁻¹数据，在Bₛ⁰→J/ψφ衰变中测量了Bₛ⁰介子的轻质量和重质量本征态BₛL⁰和BₛH⁰的平均寿命τ = 2/(ΓL + ΓH)以及衰变宽度差ΔΓ = ΓL - ΓH。假设CP守恒（这是标准模型中Bₛ⁰系统的一个良好近似），我们得到ΔΓ = 0.076₋₀.₀₆₃⁺₀.₀₅₉(统计)+/₋0.006(系统) ps⁻¹和τ = 1.52+/₋0.04(统计)+/₋0.02(系统) ps，这是迄今为止最精确的测量结果。我们对弱相位和ΔΓ的限制与CP守恒一致。
