用ATLAS探测器探测无中微子$τ\longrightarrow 3μ$衰变的轻子味破坏
Probing lepton flavour violation via neutrinoless $τ\longrightarrow 3μ$ decays with the ATLAS detector
摘要:
本文介绍了ATLAS实验对$τ\to 3μ$轻子味破坏衰变的灵敏度。使用了一种通过$W\toτν$衰变产生$τ$轻子的方法。该方法应用于2012年在LHC的ATLAS实验收集的质量中心能量为8 TeV的$pp$碰撞数据的20.3 fb $^{-1}$样本。没有观察到通过选择标准的事件,并且在90%置信水平下,$τ$轻子分支成三个μ子的分数${\rm Br}(τ\to 3μ)$的观测(预期)上限为$3.76\times 10^{-7}$($3.94\times 10^{-7}$)。
英文摘要:
This article presents the sensitivity of the ATLAS experiment to the lepton-flavour-violating decays of $τ\to 3μ$. A method utilising the production of $τ$ leptons via $W\toτν$ decays is used. This method is applied to the sample of 20.3 fb$^{-1}$ of $pp$ collision data at a centre-of-mass energy of 8 TeV collected by the ATLAS experiment at the LHC in 2012. No event is observed passing the selection criteria, and the observed (expected) upper limit on the $τ$ lepton branching fraction into three muons, ${\rm Br}(τ\to 3μ)$, is $3.76\times 10^{-7}$ ($3.94\times 10^{-7}$) at 90% confidence level.
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