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arXiv 2007.05658hep-ex
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在$\sqrt{s} =$ 13 TeV质子-质子碰撞中寻找轻子味破坏衰变$τ$ $\to$ 3 $μ$

Search for the lepton flavor violating decay $τ$ $\to$ 3$μ$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

本文报道了在$\sqrt{s} =$ 13 TeV质子-质子碰撞中寻找轻子味破坏衰变$τ$ $\to$ 3 $μ$的结果。数据样本对应于2016年LHC CMS实验记录的33.2 fb $^{-1}$的积分光度。搜索利用了W玻色子和重味强子衰变中产生的$τ$轻子。未观察到显著超出预期背景。在90%置信水平下,支化分数$\mathcal{B}(τ$ $\to$ 3 $μ)$的上限为8.0 $\times$ 10 $^{-8}$,预期上限为6.9 $\times$ 10 $^{-8}$。

英文摘要:

Results are reported from a search for the lepton flavor violating decay $τ$ $\to$ 3$μ$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV. The data sample corresponds to an integrated luminosity of 33.2 fb$^{-1}$ recorded by the CMS experiment at the LHC in 2016. The search exploits $τ$ leptons produced in both W boson and heavy-flavor hadron decays. No significant excess above the expected background is observed. An upper limit on the branching fraction $\mathcal{B}(τ$ $\to$ 3$μ)$ of 8.0 $\times$ 10$^{-8}$ at 90% confidence level is obtained, with an expected upper limit of 6.9 $\times$ 10$^{-8}$.

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