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arXiv 1306.1291hep-ph
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超对称模型中最轻希格斯玻色子的不可见衰变

Invisible decays of the lightest Higgs boson in supersymmetric models

B. Ananthanarayan, Jayita Lahiri, P. N. Pandita, Monalisa Patra

摘要:

我们考虑超对称模型,其中最轻的希格斯标量可以衰变看不见的约束一致的$126$ ~GeV的状态发现在欧洲核子研究中心的大型强子对撞机。本文考虑了最小超对称标准模型~(MSSM)中的不可见衰变,以及它的包含一个额外手征单重态超场的推广,即次最小或非最小超对称标准模型~(NMSSM),在大统一尺度下考虑了具有普适和非普适Gaugino质量的MSSM,并发现只有具有非自然大表象的$E_6$大统一模型才能产生足够轻的中性伴子,而中性伴子可能导致不可见衰变$h^0 \rightarrow \tilde χ_1^0 \tilde χ_1^0$ .在此之后,我们详细考虑了NMSSM的情况下,我们还发现,在大统一尺度下,不可能有最轻的希格斯标量的不可见衰变。我们描绘了NMSSM参数空间的区域,在那里可能有最轻的希格斯玻色子具有约$126$ GeV的质量,然后集中在该区域,这种希格斯可以衰变为轻中性伴子,软高根质量$M_1$和$M_2$作为两个独立的参数,不受大统一。我们还考虑,同时,在NMSSM的另一个重要的不可见的希格斯衰变通道,即衰变到最轻的CP奇标量,$h_1 \to a_1 a_1$,这是详细研究。由于不可见Higgs分支比受到LHC结果的限制,我们发现当其他输入参数固定时,$μ_{eff} < 170$ ~GeV和$M_1 < 80$ ~GeV在NMSSM中是不利的。我们的结果的NMSSM的参数的依赖关系进行了详细讨论。

英文摘要:

We consider supersymmetric models in which the lightest Higgs scalar can decay invisibly consistent with the constraints on the $126$~GeV state discovered at the CERN LHC. We consider the invisible decay in the minimal supersymmetric standard model~(MSSM), as well its extension containing an additional chiral singlet superfield, the so-called next-to-minimal or nonminimal supersymmetric standard model~(NMSSM).We consider the case of MSSM with both universal as well as nonuniversal gaugino masses at the grand unified scale, and find that only an $E_6$ grand unified model with unnaturally large representation can give rise to sufficiently light neutralinos which can possibly lead to the invisible decay $h^0 \rightarrow \tilde χ_1^0 \tilde χ_1^0$. Following this, we consider the case of NMSSM in detail, where also we find that it is not possible to have the invisible decay of the lightest Higgs scalar with universal gaugino masses at the grand unified scale. We delineate the regions of the NMSSM parameter space where it is possible to have the lightest Higgs boson to have a mass of about $126$ GeV, and then concentrate on the region where this Higgs can decay into light neutralinos, with the soft gaugino masses $M_1$ and $M_2$ as two independent parameters, unconstrained by grand unification. We also consider, simultaneously, the other important invisible Higgs decay channel in the NMSSM, namely the decay into the lightest CP odd scalars, $h_1 \to a_1 a_1$, which is studied in detail. With the invisible Higgs branching ratio being constrained by the present LHC results, we find that $μ_{eff} < 170$~GeV and $M_1 < 80$~GeV is disfavored in NMSSM for fixed values of the other input parameters. The dependence of our results on the parameters of NMSSM is discussed in detail.

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