期刊
PHYSICAL REVIEW D
卷 92, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.012006
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- ANPCyT, Argentina
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- MPG, Germany
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- Science and Technology Facilities Council [ST/K000705/1, ST/N000420/1, ST/J005576/1, 1264199, ST/K001310/1 LHCb Upgrades, ST/M006980/1 ATLAS Upgrades, ST/K001388/1, ST/I000186/1, ST/I006080/1, ST/N000307/1, ST/J004928/1, PP/E003087/1, ST/H00100X/2, ST/M004821/1, PP/E002846/1, ST/M001733/1, ST/J00474X/1 ATLAS Upgrades, ST/K001310/1, PP/E000444/1, 1201187, 1082012, ST/L006464/1, GRIDPP, ST/M002306/1, ST/L001179/1 ATLAS Upgrade, ST/K001310/1 ATLAS Upgrades, ST/I006056/1 ATLAS Upgrade, ST/I006056/1 ATLAS Upgrades, PP/E000355/1, ST/K50208X/1, ST/J005487/1, ST/J004928/1 ATLAS Upgrades, ST/H00100X/1, ST/L000970/1, ST/J004928/1 ATLAS Upgrade, ST/L003511/1, ST/K001310/1 LHCb, ST/K001426/1 ATLAS, 1575161, ST/K001329/1, ATLAS, ST/K001418/1, ST/I006056/1, ST/M001504/1, ST/J004944/1, 1366364, ST/N000277/1, ST/L003414/1, ST/L001179/1, ST/K00137X/1, ST/L000970/1 ATLAS Upgrades, ST/M004821/1 GRIDPP, ST/L003325/1, ST/I00372X/1, ST/J00474X/1, ST/L003112/1, ST/K001302/1, ST/K001264/1 ATLAS, ST/I005803/1 GRIDPP, ST/K001248/1, ST/M003213/1, ST/G50228X/1, ST/L001195/1, ST/M001407/1, ST/M002306/1 ATLAS Upgrades, ST/L000970/1 ATLAS Upgrade, ST/K001396/1 ATLAS, ST/I000178/1, ST/K003658/1 GRIDPP, ST/M006980/1, ST/M002071/1 ATLAS Upgrades, 1521422, PP/D002915/1, ST/J005525/1, ST/M001474/1, ST/M000664/1, ST/J501074/1, ST/K003658/1, ST/L001179/1 ATLAS Upgrades, ST/M503575/1, ST/I005803/1, ST/L006480/1, ST/M007103/1 ATLAS Upgrades, ST/K001310/1 ATLAS, ST/I00372X/1 GRIDPP, ST/G502320/1, ST/L001209/1 ATLAS Upgrades] Funding Source: researchfish
We report the observation of Higgs boson decays to WW* 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 fb(-1) from root 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(-0.15)(+0.16)(stat)(-0.14)(+0.17)(syst). The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are 1.02 +/- 0.19(stat)(-0.18)(+0.22)(syst) and 1.27(-0.40)(+0.44)(stat)(-0.21)(+0.30)(syst), respectively. At root s = 8 TeV, the total production cross sections are measured to be sigma(gg -> H -> WW*) = 4.6 +/- 0.9(stat)(-0.7)(+0.8)(syst) pb and sigma(VBF H -> WW*) = 0.51(-0.15)(+0.17)(stat)(-0.08)(+0.13)(syst) 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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