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arXiv 1202.1746hep-ex
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CMS中四轻子末态SM希格斯玻色子搜索的分析策略

Analysis strategy for the SM Higgs boson search in the four-lepton final state in CMS

Alberto Graziano

摘要:

介绍了利用CMS实验在$H$ $\rightarrow$ $ZZ^{(*)}$ $\rightarrow$ $4\ell$衰变道中寻找SM希格斯玻色子的现状。描述了用于抑制背景同时保持非常高的信号效率的选择切割,以及用于估计背景产量和系统不确定性的数据驱动算法。在积分光度为$1.66 \mathrm{fb}^{-1}$的情况下,类SM希格斯截面$\times$分支比的95%CL上限排除了$150 < m_{H} < 420 \mathrm{GeV}$范围内标准模型预期值的一到两倍的截面。到目前为止,还没有发现SM希格斯玻色子存在的证据。

英文摘要:

The current status of the searches for the SM Higgs boson in the $H$$\rightarrow$$ZZ^{(*)}$$\rightarrow$$4\ell$ decay channel with the CMS experiment is presented. The selection cuts for suppressing the backgrounds while keeping very high signal efficiencies are described, along with the data-driven algorithms implemented to estimate the background yields and the systematic uncertainties. With an integrated luminosity of $1.66 \mathrm{fb}^{-1}$, upper limits at 95% CL on the SM-like Higgs cross section $\times$ branching ratio exclude cross sections from about one to two times the expected value from the Standard Model in the range $150 < m_{H} < 420 \mathrm{GeV}$. No evidence for the existence of the SM Higgs boson has been found so far.

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