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arXiv 0705.3802hep-phhep-ex
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$B_s$ -混合的理论地位和重强子的寿命

Theoretical status of $B_s$-mixing and lifetimes of heavy hadrons

Alexander Lenz

摘要:

我们回顾了寿命比$τ_{B^+} / τ_{B_d}$、$τ_{B_s} / τ_{B_d}$、$τ_{Λ_b} / τ_{B_d}$和$τ_{B_c}$以及混合量$ΔM_s$、$ΔΓ_s$和$ϕ_s$的理论状态。$ΔM_s$和$ΔΓ_s$的衰变常数已知性差,存在较大的不确定性,而比值$ΔΓ_s / ΔM_s$几乎不存在非微扰不确定性,因此可以很好地用于寻找混合参数中可能的新物理贡献。我们提出了一种非常清晰的方法来可视化新物理学的边界,并通过将最新的实验数据与理论相结合来证明这一点-人们已经得到了一些新物理学贡献的提示,但需要更精确的实验数据来得出一些明确的结论。最后,我们根据目前的理论不确定性,所有讨论的数量的排名列表,并指出可能的改进。

英文摘要:

We review the theoretical status of the lifetime ratios $τ_{B^+} / τ_{B_d}$, $τ_{B_s} / τ_{B_d}$, $τ_{Λ_b} / τ_{B_d}$ and $τ_{B_c}$ and of the mixing quantities $ΔM_s$, $ΔΓ_s$ and $ϕ_s$. $ΔM_s$ and $ΔΓ_s$ suffer from large uncertainties due to the badly known decay constants, while the ratio $ΔΓ_s / ΔM_s$ can be determined with almost no non-perturbative uncertainties, therefore it can be used perfectly to find possible new physics contributions in the mixing parameters. We suggest a very clear method of visualizing the bounds on new physics and demonstrate this by combining the latest experimental numbers on the mixing quantities quantities with theory - one already gets some hints for new physics contributions, but more precise experimental numbers are needed to draw some definite conclusions. We conclude with a ranking list of all the discussed quantities according to their current theoretical uncertainties and point out possible improvements.

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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