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Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2007 Mar 23;98(12):121801. doi: 10.1103/PhysRevLett.98.121801. Epub 2007 Mar 21.
From an analysis of the decay Bs0-->J/psi phi, we obtain the width difference between the light and heavy mass eigenstates DeltaGamma identical with (GammaL-GammaH)=0.17+/-0.09(stat)+/-0.02(syst) ps-1 and the CP-violating phase phis=-0.79+/-0.56(stat)(-0.01)(+0.14)(syst). Under the hypothesis of no CP violation (phis identical with 0), we obtain 1/Gamma=tau(Bs0)=1.52+/-0.08(stat)(-0.03)(+0.01)(syst) ps and DeltaGamma=0.12(-0.10)(+0.08)(stat)+/-0.02(syst) ps-1. The data sample corresponds to an integrated luminosity of about 1.1 fb-1 accumulated with the D0 detector at the Fermilab Tevatron collider. This is the first direct measurement of the CP-violating mixing phase in the Bs0 system.
通过对衰变(B_s^0\to J/\psi\varphi)的分析，我们得到轻质量本征态和重质量本征态之间的宽度差(\Delta\Gamma\equiv(\Gamma_L - \Gamma_H)=0.17\pm0.09)（统计）(\pm0.02)（系统）(ps^{-1})以及CP破坏相位(\varphi_s=-0.79\pm0.56)（统计）((-0.01)(+0.14))（系统）。在无CP破坏（(\varphi_s\equiv0)）的假设下，我们得到(1/\Gamma=\tau(B_s^0)=1.52\pm0.08)（统计）((-0.03)(+0.01))（系统）(ps)以及(\Delta\Gamma=0.12)（(-0.10)((+0.08)）（统计）(\pm0.02)（系统）(ps^{-1})。数据样本对应于费米实验室Tevatron对撞机上D0探测器积累的约(1.1) (fb^{-1})的积分亮度。这是对(B_s^0)系统中CP破坏混合相位的首次直接测量。
