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arXiv 1602.06198hep-phhep-ex
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用顶夸克对增强Higgs的关联产生

Enhancing the Higgs associated production with a top quark pair

Marcin Badziak, Carlos E. M. Wagner

摘要:

本文指出,在一系列类似于II型双希格斯双重模型(2 HDM)的模型中,与顶-反顶夸克对($tth$)结合并衰变为规范玻色子的希格斯粒子的信号可以显著大于标准模型(SM)的预测,而不违反任何实验约束。这些模型的关键特征是增强(抑制)希格斯耦合到顶(底)夸克和浅色粒子的存在,给予负贡献的有效希格斯耦合到胶子导致胶子融合率在规范玻色子衰变通道接近SM预测。我们证明了这一机制在NMSSM与光停止,并表明$tth$信号在$WW$衰变通道可以是2倍以上的SM预测,建议由ATLAS和CMS观察到的过剩,只要希格斯单线态超势耦合$λ\gtrsim0.8$和MSSM类希格斯玻色子质量在160至300 GeV的范围内。

英文摘要:

It is pointed out that in a wide class of models reminiscent of type-II Two-Higgs-Doublet Models (2HDM) the signal of the Higgs produced in association with a top-antitop quark pair ($tth$) and decaying into gauge bosons can be significantly larger than the Standard Model (SM) prediction without violating any experimental constraints. The crucial feature of these models is enhanced (suppressed) Higgs coupling to top (bottom) quarks and existence of light colored particles that give negative contribution to the effective Higgs coupling to gluons resulting in the gluon fusion rates in the gauge boson decay channels close to SM predictions. We demonstrate this mechanism in NMSSM with light stops and show that $tth$ signal in the $WW$ decay channel can be two times larger than the SM prediction, as suggested by the excesses observed by ATLAS and CMS, provided that the Higgs-singlet superpotential coupling $λ\gtrsim0.8$ and the MSSM-like Higgs boson masses are in the range of 160 to 300 GeV.

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