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arXiv 0708.0733hep-ex
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$η$介子模中强子$τ$衰变的精确测量

Precise measurement of hadronic $τ$-decays in modes with $η$ mesons

The Belle Collaboration, K. Abe

摘要:

我们利用在KEKB非对称能量e^+e^-对撞机上Belle探测器收集的485 fb^{-1}的数据,测量了包含$η$介子的强子$τ$衰变的分支分数。我们获得了以下分支分数:${\cal B}(τ^-\to K^- ην_τ)=(1.62\pm 0.05 \pm 0.09)\times 10^{-4}$,${\cal B}(τ^-\to K^- π^0 ην_τ) =(4.7\pm 1.1 \pm 0.4)\times 10^{-5}$,${\cal B}(τ^-\to π^- π^0 ην_τ)=(1.39 \pm 0.03 \pm 0.07) \times 10^{-3}$和${\cal B}(τ^-\to K^{*-} ην_τ)=(1.13\pm 0.19 \pm 0.07)\times 10^{-4}$,与以前最好的测量相比,分别提高了六倍,八倍,四倍和四倍的精度。

英文摘要:

We have measured branching fractions of hadronic $τ$ decays involving an $η$ meson using 485 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We obtain the following branching fractions: ${\cal B}(τ^-\to K^- ην_τ)=(1.62\pm 0.05 \pm 0.09)\times 10^{-4}$, ${\cal B}(τ^-\to K^- π^0 ην_τ) =(4.7\pm 1.1 \pm 0.4)\times 10^{-5}$, ${\cal B}(τ^-\to π^- π^0 ην_τ)=(1.39 \pm 0.03 \pm 0.07) \times 10^{-3}$, and ${\cal B}(τ^-\to K^{*-} ην_τ)=(1.13\pm 0.19 \pm 0.07)\times 10^{-4}$ improving the accuracy compared to the best previous measurements by factors of six, eight, four and four, respectively.

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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