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Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2007 Apr 13;98(15):151801. doi: 10.1103/PhysRevLett.98.151801. Epub 2007 Apr 11.
We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic Bs0 decays ASLs,unt by comparing the decay rate of Bs0-->micro+Ds-nuX, where Ds- -->phipi- and phi-->K+K-, with the charge-conjugate Bs0 decay rate. This sample was selected from 1.3 fb-1 of data collected by the D0 experiment in run II of the Fermilab Tevatron collider. We obtain ASLs,unt=[1.23+/-0.97(stat)+/-0.17(syst)]x10(-2). Assuming that Deltam(s)/Gamma(s)>>1, this result can be translated into a measurement of the CP-violating phase in Bs0 mixing: DeltaGamma(s)/Deltam(s)tanphi(s)=[2.45+/-1.93(stat)+/-0.35(syst)]x10(-2).
我们通过比较(B_s^0\to\mu^+\ D_s^-\ \nu_X)（其中(D_s^-\to\phi\pi^-)且(\phi\to K^+K^-)）的衰变率与电荷共轭的(B_s^0)衰变率，首次对半轻子(B_s^0)衰变中的时间积分味未标记电荷不对称性(A_{SL,unt})进行了直接测量。该样本是从费米实验室Tevatron对撞机运行II期的D0实验收集的1.3(fb^{-1})数据中选取的。我们得到(A_{SL,unt}=[1.23\pm0.97(统计)\pm0.17(系统)]\times10^{-2})。假设(\Delta m_s / \Gamma_s\gg1)，该结果可转化为对(B_s^0)混合中CP破坏相位的测量：(\Delta\Gamma_s / \Delta m_s\tan\phi_s=[2.45\pm1.93(统计)\pm0.35(系统)]\times10^{-2})。
