Little Higgs theory confronted with the LHC Higgs data
Little Higgs theory confronted with the LHC Higgs data
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小希格斯理论遭遇大型强子对撞机希格斯数据
DOI：
10.1103/physrevd.87.055004
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
J. Zhu
中科院分区：
文献类型：
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作者：
X. Han;L. Wang;J. M. Yang;J. Zhu
我们将小希格斯理论与LHC希格斯粒子搜索数据（7和8 TeV的总能量中的17 fb（-1））进行了比较。考虑几个典型的模型，即最小Higgs模型、具有T宇称的最小Higgs模型（LHT-A和LHT-B）和最简单的小Higgs模型，我们在现有实验允许的范围内对参数空间进行了扫描。我们发现，在这些模型中的包容性和排他性（通过胶子-胶子融合）的双光子和ZZ* 信号率的希格斯玻色子总是被抑制，并接近标准模型预测的大规模f。因此，ZZ* 信号速率在实验数据的1西格玛范围内，而包含性双光子信号速率总是在2西格玛范围之外。特别是，在LHT-A的双光子信号率是3 σ范围外的实验数据为f < 800 GeV。我们还对现有的LHC和Tevatron Higgs数据进行了全局chi（2）拟合，发现这些模型对整个数据集没有提供更好的全局拟合（仅对于某些特殊通道可以获得更好的拟合，特别是在LHT-B中）。DOI：10.1103/PhysRevD.87.055004
We confront the little Higgs theory with the LHC Higgs search data (up to 17 fb(-1) of the combined 7 and 8 TeV run). Considering some typical models, namely, the littlest Higgs model, the littlest Higgs model with T parity (LHT-A and LHT-B), and the simplest little Higgs model, we scan over the parameter space in the region allowed by current experiments. We find that in these models the inclusive and exclusive (via gluon-gluon fusion) diphoton and ZZ* signal rates of the Higgs boson are always suppressed and approach the standard model predictions for a large-scale f. Thus, the ZZ* signal rate is within the 1 sigma range of the experimental data while the inclusive diphoton signal rate is always outside the 2 sigma range. Especially, in the LHT-A the diphoton signal rate is outside the 3 sigma range of the experimental data for f < 800 GeV. We also perform a global chi(2) fit to the available LHC and Tevatron Higgs data, and find that these models provide no better global fit to the whole data set (only for some special channels a better fit can be obtained, especially in the LHT-B). DOI: 10.1103/PhysRevD.87.055004