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arXiv 0811.2173hep-ex
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衰变B_s^0 --> D_s ^(*)D_s^(*)的证据和Delta_Gamma_s^ CP /Gamma_s的测量

Evidence for the decay B_s^0 --> D_s^(*)D_s^(*) and a measurement of Delta_Gamma_s^CP/Gamma_s

D0 Collaboration, V. M. Abazov

摘要:

我们利用费米实验室Tevatron对撞机上运行的D 0探测器记录的2.8 fb^-1的ppbar碰撞,在s^(1/2)= 1.96 TeV的能量下,寻找半包含过程B_s^0 -> D_s ^(*)D_s^(*)。我们观察到26.6 +/- 8.4个信号事件,其显著性高于背景值3.2个标准差,产生Br(B_s^0 --> D_s ^(*)D_s^(*))= 0.035 +/- 0.010(stat)+/- 0.011(syst)的分支比。在某些理论假设下,这些双粲末态使B_s^0衰变中的CP偶本征态饱和,导致宽度差Δ_Gamma_s^CP/Gamma_s = 0.072 +/- 0.021(stat)+/- 0.022(syst)。

英文摘要:

We search for the semi-inclusive process B_s^0 --> D_s^(*)D_s^(*) using 2.8 fb^-1 of ppbar collisions at s^(1/2) = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We observe 26.6 +/- 8.4 signal events with a significance above background of 3.2 standard deviations yielding a branching ratio of Br(B_s^0 --> D_s^(*)D_s^(*)) = 0.035 +/- 0.010(stat) +/- 0.011(syst). Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the B_s^0 decays resulting in a width difference of Delta_Gamma_s^CP/Gamma_s = 0.072 +/- 0.021(stat) +/- 0.022(syst).

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