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arXiv 1506.06641hep-ex
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用ATLAS探测器研究$H \rightarrow WW^{\ast}$衰变产生$(W/Z)H$和希格斯玻色子耦合

Study of $(W/Z)H$ production and Higgs boson couplings using $H \rightarrow WW^{\ast}$ decays with the ATLAS detector

ATLAS Collaboration

摘要:

在$H \rightarrow WW^{\ast}$衰变通道中,用ATLAS探测器在LHC收集的数据样本搜索与$W$或$Z$玻色子相关的希格斯玻色子的产生,质子-质子碰撞的质心能量分别为$\sqrt{s}=7$ TeV和8 TeV,对应于4.5 ${\rm fb}^{-1}$和20.3 ${\rm fb}^{-1}$的积分光度。在二轻子和三轻子末态下研究了$WH$产生模,而在二轻子和四轻子末态下研究了$ZH$产生模。对于组合的$WH$和$ZH$产生,观察到的显著性为2.5标准差,而在标准模型希格斯玻色子假设中预期0.9标准差的显著性。对于质量为125.36 GeV的希格斯玻色子,$WH$和$ZH$的组合信号产额与标准模型期望值$μ_{VH}$的比值为$μ_{VH} =3.0^{+1.3}_{-1.1}{\, {(\rm stat.)}}^{+1.0}_{-0.7}{\,{(\rm sys.)}}$。$WH$和$ZH$产生模式也与在$H \to WW^* \to \ell ν\ell ν$衰变通道中研究的胶子融合和矢量玻色子融合产生模式相结合,导致6.5标准差和$μ_{\rm ggF+VBF+VH} = 1.16^{+0.16}_{-0.15} {\rm (stat.)}^{+0.18}_{-0.15} {\rm (sys.)}$的总体观察显著性。用希格斯玻色子与矢量玻色子($κ_V$)和费米子($κ_F$)耦合的标度因子对结果进行了解释;综合结果为:$|κ_V| = 1.06^{+0.10}_{-0.10}$,$|κ_F| = 0.85^{+0.26}_{-0.20}$ .

英文摘要:

A search for Higgs boson production in association with a $W$ or $Z$ boson, in the $H \rightarrow WW^{\ast}$ decay channel, is performed with a data sample collected with the ATLAS detector at the LHC in proton-proton collisions at centre-of-mass energies $\sqrt{s}=7$ TeV and 8 TeV, corresponding to integrated luminosities of 4.5 ${\rm fb}^{-1}$ and 20.3 ${\rm fb}^{-1}$, respectively. The $WH$ production mode is studied in two-lepton and three-lepton final states, while two-lepton and four-lepton final states are used to search for the $ZH$ production mode. The observed significance, for the combined $WH$ and $ZH$ production, is 2.5 standard deviations while a significance of 0.9 standard deviations is expected in the Standard Model Higgs boson hypothesis. The ratio of the combined $WH$ and $ZH$ signal yield to the Standard Model expectation, $μ_{VH}$, is found to be $μ_{VH} =3.0^{+1.3}_{-1.1}{\, {(\rm stat.)}}^{+1.0}_{-0.7}{\,{(\rm sys.)}}$ for the Higgs boson mass of 125.36 GeV. The $WH$ and $ZH$ production modes are also combined with the gluon fusion and vector boson fusion production modes studied in the $H \to WW^* \to \ell ν\ell ν$ decay channel, resulting in an overall observed significance of 6.5 standard deviations and $μ_{\rm ggF+VBF+VH} = 1.16^{+0.16}_{-0.15} {\rm (stat.)}^{+0.18}_{-0.15} {\rm (sys.)}$. The results are interpreted in terms of scaling factors of the Higgs boson couplings to vector bosons ($κ_V$) and fermions ($κ_F$); the combined results are: $|κ_V| = 1.06^{+0.10}_{-0.10}$, $|κ_F| = 0.85^{+0.26}_{-0.20}$.

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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