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arXiv 2006.03527hep-phhep-ex
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半约束NMSSM中Higgs衰变为轻标量

Higgs decay to light scalars in the semi-constrained NMSSM

Shiquan Ma, Kun Wang, Jingya Zhu

摘要:

具有非普适希格斯质量的次最小超对称标准模型(NMSSM)或半约束NMSSM(scNMSSM)通过单重超场扩展了最小超对称标准模型(MSSM),并假设除了希格斯扇区之外的普适条件。它不仅保持了完全约束的MSSM和NMSSM的简洁和优雅,缓解了125 GeV希格斯玻色子发现后它们所面临的紧张,而且预言了Higgs衰变为一对轻单态主导标量($10\!\sim\! 60\;{\rm GeV}$)的奇异现象。根据类SM希格斯粒子和光标量的恒等式,这个条件可以分为三种情况:(i)光标量是CP-奇数,类SM希格斯粒子是$h_2$ ;(ii)光标量是CP-奇数,类SM希格斯粒子是$h_1$ ;(iii)光标量是CP-偶数,类SM希格斯粒子是$h_2$。在本工作中,我们比较了这三种情况,检查了导致这些情况的有趣的参数方案,双重和单重态的混合水平,SM-样希格斯粒子与一对光标量之间的三标量耦合,希格斯衰变到光标量的分支比,以及在HL-LHC和未来的轻子对撞机如CEPC,FCC-ee,ILC的。

英文摘要:

The next-to minimal supersymmetric standard model (NMSSM) with non-universal Higgs masses, or the semi-constrained NMSSM (scNMSSM), extend the minimal supersymmetric standard model (MSSM) by a singlet superfield and assume universal conditions except for the Higgs sector. It can not only keep the simpleness and grace of the fully constrained MSSM and NMSSM, and relax the tension that they face after the 125-GeV Higgs boson discovered, but also predict an exotic phenomenon that Higgs decay to a pair of light singlet-dominated scalars ($10\!\sim\! 60\;{\rm GeV}$). This condition can be classified to three scenarios according to the identities of the SM-like Higgs and the light scalar: (i) the light scalar is CP-odd, and the SM-like Higgs is $h_2$; (ii) the light scalar is CP-odd, and the SM-like Higgs is $h_1$; (iii) the light scalar is CP-even, and the SM-like Higgs is $h_2$. In this work, we compare the three scenarios, checking the interesting parameter schemes that lead to the scenarios, the mixing levels of the doublets and singlets, the tri-scalar coupling between the SM-like Higgs and a pair of light scalars, the branching ratio of Higgs decay to the light scalars, and sensitivities in hunting for the exotic decay at the HL-LHC and the future lepton colliders such as CEPC, FCC-ee, and ILC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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