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arXiv 1906.03389hep-ph
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一般NMSSM中的轻希格斯玻色子

Light Higgs bosons in the general NMSSM

Kiwoon Choi, Sang Hui Im, Kwang Sik Jeong, Chan Beom Park

摘要:

超越标准模型(SM)的物理学可能会表现为与SM预测的125 GeV希格斯信号强度的微小偏差。那么,一个合理的和有趣的可能性是,希格斯扇区是扩展的,在弱尺度下,出现了一个额外的希格斯玻色子玻色子弱耦合到SM扇区。结合$e^+e^-\to Z(h\to b\bar b)$中的LEP过剩,CMS最近报道的96 GeV左右的双光子过剩可能表明了这种可能性。我们研究如果这些LEP和CMS的过度可以同时解释一个单线态希格斯玻色子在一般的下一个最小的超对称标准模型(NMSSM)。NMSSM中的Higgs混合依赖于单重态与MSSM Higgs二重态的耦合和Higgsino质量参数,因此受到这些超对称参数的约束。我们发现NMSSM可以解释96 GeV的LEP和CMS过剩,同时容纳观察到的125 GeV的SM类希格斯玻色子玻色子。有趣的是,所需的混合角限制了重二重态希格斯玻色子玻色子的质量超过500 GeV。我们还表明,混合参数空间的可行区域是相当大的修改,如果希格斯质量参数是周围的弱标度,主要是因为希格斯耦合到光子诱导的带电希格斯。

英文摘要:

Physics beyond the Standard Model (SM) may manifest itself as small deviations from the SM predictions for Higgs signal strengths at 125 GeV. Then, a plausible and interesting possibility is that the Higgs sector is extended and at the weak scale there appears an additional Higgs boson weakly coupled to the SM sector. Combined with the LEP excess in $e^+e^-\to Z(h\to b\bar b)$, the diphoton excess around 96 GeV recently reported by CMS may suggest such a possibility. We examine if those LEP and CMS excesses can be explained simultaneously by a singlet-like Higgs boson in the general next-to-minimal supersymmetric Standard Model (NMSSM). Higgs mixing in the NMSSM relies on the singlet coupling to the MSSM Higgs doublets and the higgsino mass parameter, and thus is subject to the constraints on these supersymmetric parameters. We find that the NMSSM can account for both the LEP and CMS excesses at 96 GeV while accommodating the observed 125 GeV SM-like Higgs boson. Interestingly, the required mixing angles constrain the heavy doublet Higgs boson to be heavier than about 500 GeV. We also show that the viable region of mixing parameter space is considerably modified if the higgsino mass parameter is around the weak scale, mainly because of the Higgs coupling to photons induced by the charged higgsinos.

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