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arXiv 0708.3276hep-ex
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在Belle寻找轻子味破坏$τ\to \ell V^0$衰变

Search for lepton flavor violating $τ\to \ell V^0$ decays at Belle

The Belle Collaboration, K. Abe

摘要:

我们利用KEKB非对称能量$e^+e^-$对撞机Belle探测器收集的543 fb $^{-1}$数据,寻找了无中微子$τ$轻子衰变为$\ell$和$V^0$的过程,其中$\ell$代表电子或μ子,$V^0$代表矢量介子($ϕ$、$ω$、$K^{*0}$或$\bar{K}^{*0}$)。没有观察到超过预期背景的信号事件,并且我们在$(0.7 - 1.8) \times 10^{-7}$范围内以90%置信水平设定分支分数的上限。这些上限包括$\ell ω$的第一个结果,以及比我们以前的$\ell ϕ$、$\ell K^{*0}$和$\ell \bar{K}^{*0}$结果更严格的$3.6 - 9.6$倍的新限值。

英文摘要:

We have searched for neutrinoless $τ$ lepton decays into $\ell$ and $V^0$, where $\ell$ stands for an electron or muon, and $V^0$ for a vector meson ($ϕ$, $ω$, $K^{*0}$ or $\bar{K}^{*0}$), using 543 fb$^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No excess of signal events over the expected background is observed, and we set upper limits on the branching fractions in the range $(0.7 - 1.8) \times 10^{-7}$ at the 90% confidence level. These upper limits include the first results for $\ell ω$ as well as new limits that are $3.6 - 9.6$ times more restrictive than our previous results for $\ell ϕ$, $\ell K^{*0}$ and $\ell \bar{K}^{*0}$.

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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