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University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2006 Dec 15;97(24):242003. doi: 10.1103/PhysRevLett.97.242003. Epub 2006 Dec 12.
We report the observation of Bs(0)-Bs(0) oscillations from a time-dependent measurement of the Bs(0)-Bs(0) oscillation frequency Deltams. Using a data sample of 1 fb(-1) of pp collisions at square root of s=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic Bs decays, 3100 partially reconstructed hadronic Bs decays, and 61,500 partially reconstructed semileptonic Bs decays. We measure the probability as a function of proper decay time that the Bs decays with the same, or opposite, flavor as the flavor at production, and we find a signal for Bs(0)-Bs(0) oscillations. The probability that random fluctuations could produce a comparable signal is 8 x 10(-8), which exceeds 5sigma significance. We measure Deltams=17.77 +/- 0.10(stat) +/- 0.07(syst) ps(-1) and extract /V(td)/V(ts)/=0.2060+/-0.0007(Deltams)(-0.0060)(+0.008)(Deltamd+theor).
我们通过对(B_s^0 - \overline{B_s^0})振荡频率(\Delta m_s)进行与时间相关的测量，报告了对(B_s^0 - \overline{B_s^0})振荡的观测结果。利用费米实验室Tevatron的CDF II探测器收集的(\sqrt{s}=1.96)TeV的质子 - 质子碰撞的(1)fb(^{-1})数据样本，我们发现了(5600)个完全重建的强子(B_s)衰变信号、(3100)个部分重建的强子(B_s)衰变信号以及(61500)个部分重建的半轻子(B_s)衰变信号。我们测量了(B_s)衰变时其味道与产生时味道相同或相反的概率作为固有衰变时间的函数，并且我们发现了(B_s^0 - \overline{B_s^0})振荡的信号。随机涨落产生可比信号的概率为(8×10^{-8})，超过了(5\sigma)显著性。我们测量得到(\Delta m_s = 17.77 ± 0.10)(统计)(± 0.07)(系统)(ps^{-1})，并提取出(\vert V_{td} / V_{ts} \vert = 0.2060 ± 0.0007)((\Delta m_s))(^{-0.0060})(^{+0.008})((\Delta m_d)理论值) 。
