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arXiv 1008.4869hep-ph
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三重态模型中的Higgs耦合

Higgs couplings in a model with triplets

Heather E. Logan, Marc-Andre Roy

摘要:

本文研究了一个纯SU(2)_L偶重态、一个实三重态和一个超荷为1的复三重态模型中CP偶中性希格斯玻色子玻色子h的耦合。因为两个三重态贡献于具有相反符号的ρ参数,所以三重态真空期望值可以是相当大的。我们证明了(i)hWW和hZZ耦合可以大于标准模型中的相应值,以及(ii)h的WW和ZZ耦合的比率可以不同于标准模型中的相应比率。这两个结果都不可能发生在只包含希格斯双重态的模型中。我们还计算了gg --> h --> WW和gg --> h --> ZZ的强子对撞机速率,发现在合理的参数值和M_h ~ 140-180 GeV下,gg --> h --> WW(ZZ)的强子对撞机速率比标准模型的强子对撞机速率大20%(5倍)。我们讨论了希格斯耦合提取在LHC的影响。

英文摘要:

We study the couplings of a CP-even neutral Higgs boson h in a model containing one scalar SU(2)_L doublet, one real triplet, and one complex triplet with hypercharge 1. Because the two triplets contribute to the rho parameter with opposite signs, the triplet vacuum expectation values can be sizable. We show that (i) the hWW and hZZ couplings can be larger than the corresponding values in the Standard Model, and (ii) the ratio of the WW and ZZ couplings of h can be different than the corresponding ratio in the Standard Model. Neither of these results can occur in models containing only Higgs doublets. We also compute the rates for gg --> h --> WW and gg --> h --> ZZ and find that, for reasonable parameter values and M_h ~ 140-180 GeV, the hadron collider rate for gg --> h --> WW (ZZ) can be up to 20% (5 times) larger than in the Standard Model. We discuss implications for Higgs coupling extraction at the LHC.

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