Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
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DOI：
10.1007/jhep11(2015)206
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发表时间：
2015-11-30
影响因子：
5.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
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作者：
Aad, G.;Abbott, B.;Zwalinski, L.
LHC 的 ATLAS 实验测量了希格斯玻色子耦合和质量，并寻找不可见的希格斯玻色子衰变，使用多个产生和衰变通道，在根 S = 7 TeV 处具有高达 4.7 fb(-1) 的 pp 碰撞数据，在根 s = 8 TeV 处具有高达 20.3 fb(-1) 的 pp 碰撞数据。在当前的研究中，观测到的伽马伽马、ZZ、WW、Z伽玛、bb、tau tau和mu mu衰变通道中观测到的希格斯玻色子的产生和衰变率的测量，以及希格斯玻色子与顶夸克对的相关产生的结果，被用来探测与质量耦合的比例。标准模型扩展中的参数受到限制，包括复合希格斯玻色子、附加电弱单线态和两个希格斯双线态模型。结合伽马伽马和 ZZ 衰变模式中标量希格斯玻色子的测量质量，在“hMSSM”简化的最小超对称标准模型中，对 m(A) > 370 GeV 的赝标量希格斯玻色子质量设定了下限。直接搜索重希格斯玻色子的结果也在 hMSSM 中得到解释。在矢量-玻色子融合中直接搜索不可见的希格斯玻色子衰变以及相关的具有 W/Z (Z -> ll, W/Z -> jj) 模式的希格斯玻色子的产生在统计上被组合起来，以将希格斯玻色子不可见分支比的上限设定为 0.25。在更一般的耦合拟合中使用测量到的可见光衰变率将上限提高到 0.23，限制了暗物质的希格斯门户模型。
The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb(-1) of pp collision data at root S = 7 TeV and 20.3 fb(-1) at root s = 8 TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the gamma gamma, ZZ, WW, Z gamma, bb, tau tau, and mu mu decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the gamma gamma and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of m(A) > 370 GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z -> ll, W/Z -> jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.