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arXiv 0812.3804hep-ex
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用BaBar实验寻找轻子味破坏衰变$τ\to \ell K^0_S$

Search for Lepton Flavour Violating Decays $τ\to \ell K^0_S$ with the BaBar Experiment

The BaBar Collaboration, B. Aubert

备注：
9 pages, 8 postscript figures, submitted to Phys. Rev. D
发表信息：
Phys.Rev.D79:012004,2009
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摘要：

轻子味破坏衰变$τ^- \to l^- K^0_{\scriptscriptstyle S}$的研究已经使用对应于469 ${fb}^{-1}$，使用{ \slshape B \kern-0.1em { \smaller}采集ABMS A} \kern-0.1em B \kern-0.1em {\smaller A \kern-0.2em R}}检测器，位于SLAC PETRONIC @-II $e^+e^-$非对称能量对撞机。在任一通道中均未观察到统计学显著信号，在90%置信水平下，分支分数的估计上限为${\cal B}(τ^- \to e^- K^0_{\scriptscriptstyle S}) < 3.3 \times 10^{-8}$和${\cal B}(τ^- \to μ^- K^0_{\scriptscriptstyle S}) < 4.0 \times 10^{-8}$。

英文摘要：

A search for the lepton flavour violating decays $τ^- \to l^- K^0_{\scriptscriptstyle S}$ ($l = e$ or $μ$) has been performed using a data sample corresponding to an integrated luminosity of 469 ${fb}^{-1}$, collected with the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at the SLAC PEP-II $e^+e^-$ asymmetric energy collider. No statistically significant signal has been observed in either channel and the estimated upper limits on branching fractions are ${\cal B}(τ^- \to e^- K^0_{\scriptscriptstyle S}) < 3.3 \times 10^{-8}$ and ${\cal B}(τ^- \to μ^- K^0_{\scriptscriptstyle S}) < 4.0 \times 10^{-8}$ at 90% confidence level.

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