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arXiv 1108.5769hep-phhep-ex
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$B_s (\bar B_s)$ -> $D^0_{CP} K {\bar K}$:探测和鉴别$B_s$ - $\bar B_s$混合中的新物理

$B_s (\bar B_s)$ -> $D^0_{CP} K {\bar K}$: Detecting and Discriminating New Physics in $B_s$-$\bar B_s$ Mixing

Soumitra Nandi, David London

摘要:

如果发现B_s-反B_s混合的弱相位(2 β_s)明显不同于零,这是新物理(NP)的明确信号。然而,如果发现这样的信号,我们希望明确确定2 β_s,以确定哪些NP模型可能负责。此外,在NP存在的情况下,两个B_s质量本征态的宽度差ΔΓ_s可以是正的,也可以是负的,理想情况下这种符号模糊性应该通过实验来解决。最后,为了查看除了M^ s_{12}之外,NP是否对T ^ s_{12}有贡献,|s_{12}|是至关重要的.本文考虑了几种测量B_s-反B_s混合的不同方法,它们都是利用带有${\bar b} \to {\bar c} u {\bar s}$和${\bar b} \to {\bar u} c {\bar s}$跃迁的二体和三体衰变。我们发现,其中最有前途的是一个时间依赖性达利兹图分析$B_s (\bar B_s) \to D^0_{CP} K {\bar K}$。通过这些衰变,可以解决上述所有问题,并且还可以测量弱相位伽马。我们还注意到,对于所有三体衰变,即使不确定CP相位phi_s,也可以解决Δ r_s的符号模糊性。

英文摘要:

If the weak phase of B_s-anti B_s mixing (2 beta_s) is found to be significantly different from zero, this is a clear signal of new physics (NP). However, if such a signal is found, we would like an unambiguous determination of 2 beta_s in order to ascertain which NP models could be responsible. In addition, in the presence of NP, the width difference ΔΓ_s between the two B_s mass eigenstates can be positive or negative, and ideally this sign ambiguity should be resolved experimentally. Finally, in order to see if the NP is contributing to Γ^s_{12} in addition to M^s_{12}, the precise measurement of |Γ^s_{12}| is crucial. In this paper, we consider several different methods of measuring B_s-anti B_s mixing using two- and three-body decays with ${\bar b} \to {\bar c} u {\bar s}$ and ${\bar b} \to {\bar u} c {\bar s}$ transitions. We find that the most promising of these is a time-dependent Dalitz-plot analysis of $B_s (\bar B_s) \to D^0_{CP} K {\bar K}$. With these decays, all of the above issues can be addressed, and the measurement of the weak phase gamma is also possible. We also note that, with all three-body decays it is possible to resolve the sign ambiguity of ΔΓ_s even without determining the CP phase phi_s.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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