arXiv 1412.26412014-12hep-ex

用ATLAS探测器观测希格斯玻色子衰变到$WW^{\ast}$

Observation and measurement of Higgs boson decays to $WW^{\ast}$ with the ATLAS detector

ATLAS Collaboration

备注：: Published version, 69 pages plus author list + cover pages (83 pages total), 47 figures, 30 tables, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-13/
发表信息：: Phys. Rev. D 92, 012006 (2015)
DOI：: 10.1103/PhysRevD.92.012006

摘要：

本文报道了在双轻子末态下，基于$6.1$标准差的背景值，观测到希格斯玻色子衰变为$WW^{\ast}$，其中标准模型的期望值是$5.8$标准差.矢量玻色子融合（VBF）的生产过程中获得的证据与3.2标准偏差的意义。这些结果是从一个数据样本中获得的，该数据样本对应于由ATLAS探测器在LHC记录的$\sqrt{s}=7$和8 TeV $pp$碰撞的$25\,\textrm{fb}^{-1}$的积分光度。对于125.36 GeV的希格斯玻色子质量，总产生横截面乘以分支分数的测量值与期望值之比为$1.09^{+0.16}_{-0.15}\,\textrm{(stat)}^{+0.17}_{-0.14}\,\textrm{(syst)}$。胶子融合和矢量-玻色子融合产生机制的相应比率分别为$1.02\pm 0.19\,\textrm{(stat)}^{+0.22}_{-0.18}\,\textrm{(syst)}$和$1.27^{+0.44}_{-0.40}\,\textrm{(stat)}^{+0.30}_{-0.21}\,\textrm{(syst)}$。在$\sqrt{s}=8$ TeV处，测量的总产生截面为$σ(gg\to$、$H\rightarrow WW^\ast) = 4.6\pm0.9\,\textrm{(stat)}\,^{+0.8}_{-0.7}\,\textrm{(syst)}\textrm{pb}$和$σ(\textrm{VBF}$ $H\rightarrow WW^\ast) = 0.51\,^{+0.17}_{-0.15}\,\textrm{(stat)}\,^{+0.13}_{-0.08}\,\textrm{(syst)}\textrm{pb}$。基准截面确定的胶子融合过程中的排他性的最终状态与零或一个相关的射流。

英文摘要：

We report the observation of Higgs boson decays to $WW^{\ast}$ based on an excess over background of $6.1$ standard deviations in the dilepton final state, where the Standard Model expectation is $5.8$ standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of $25\,\textrm{fb}^{-1}$ from $\sqrt{s}=7$ and 8 TeV $pp$ collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is $1.09^{+0.16}_{-0.15}\,\textrm{(stat)}^{+0.17}_{-0.14}\,\textrm{(syst)}$. The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are $1.02\pm 0.19\,\textrm{(stat)}^{+0.22}_{-0.18}\,\textrm{(syst)}$ and $1.27^{+0.44}_{-0.40}\,\textrm{(stat)}^{+0.30}_{-0.21}\,\textrm{(syst)}$, respectively. At $\sqrt{s}=8$ TeV, the total production cross sections are measured to be $σ(gg\to$ $H\rightarrow WW^\ast) = 4.6\pm0.9\,\textrm{(stat)}\,^{+0.8}_{-0.7}\,\textrm{(syst)}\textrm{pb}$ and $σ(\textrm{VBF}$ $H\rightarrow WW^\ast) = 0.51\,^{+0.17}_{-0.15}\,\textrm{(stat)}\,^{+0.13}_{-0.08}\,\textrm{(syst)}\textrm{pb}$. The fiducial cross section is determined for the gluon-fusion process in exclusive final states with zero or one associated jet.

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摘要：

英文摘要：

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