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arXiv 1507.01747hep-ph
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最小超对称标准模型中重希格斯玻色子的不可见衰变

Invisible decays of the heavier Higgs boson in the minimal supersymmetric standard model

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

摘要:

根据最近在欧洲核子研究中心(CERN)大型强子对撞机(LHC)上发现的126 GeV共振,考虑了最小超对称标准模型(MSSM)中较重的CP偶希格斯玻色子~($H^0$)衰变为中性伴子的可能性。为此,我们考虑了在大统一尺度下超对称破缺的加庚诺质量参数的具有普适、非普适和任意边界条件的最小超对称标准模型。一般来说,具有普适和非普适质量的情况不允许最轻的希格斯玻色子~($h^0$)(与$126$ GeV共振一致)衰变为MSSM中最轻的中性伴子。在大统一尺度下,任意的高吉诺质量,这样一种看不见的衰变是可能的。在大统一尺度下,对于任意质量的Gaugino粒子以及受普适和非普适边界条件限制的Gaugino粒子,第二轻的希格斯玻色子玻色子可以在MSSM参数空间的相当大的区域内衰变成各种不可见的末态,而对于任意质量的Gaugino粒子,第二轻的希格斯玻色子玻色子衰变成不可见通道的可能性更大.较重的希格斯玻色子衰变为较轻的粒子,这就产生了一种有趣的可能性,即在大型强子对撞机上寻找扩展的希格斯玻色子扇区时,即使整个希格斯玻色子光谱以不可见的方式衰变,它也可能在大型强子对撞机上可见。在这种情况下,MSSM的扩展希格斯扇区的未观测可能被仔细地用来排除LHC的MSSM参数空间的区域。

英文摘要:

We consider the possibility that the heavier CP-even Higgs boson~($H^0$) in the minimal supersymmetric standard model (MSSM) decays invisibly into neutralinos in the light of the recent discovery of the 126 GeV resonance at the CERN Large Hadron Collider (LHC). For this purpose we consider the minimal supersymmetric standard model with universal, non-universal and arbitrary boundary conditions on the supersymmetry breaking gaugino mass parameters at the grand unified scale. Typically, scenarios with universal and nonuniversal gaugino masses do not allow invisible decays of the lightest Higgs boson~($h^0$), which is identified with the $126$ GeV resonance, into the lightest neutralinos in the MSSM. With arbitrary gaugino masses at the grand unified scale such an invisible decay is possible. The second lightest Higgs boson can decay into various invisible final states for a considerable region of the MSSM parameter space with arbitrary gaugino masses as well as with the gaugino masses restricted by universal and nonuniversal boundary conditions at the grand unified scale.The possibility of the second lightest Higgs boson of the MSSM decaying into invisible channels is more likely for arbitrary gaugino masses at the grand unified scale. The heavier Higgs boson decay into lighter particles leads to the intriguing possibility that the entire Higgs boson spectrum of the MSSM may be visible at the LHC even if it decays invisibly, during the searches for an extended Higgs boson sector at the LHC. In such a scenario the nonobservation of the extended Higgs sector of the MSSM may carefully be used to rule out regions of the MSSM parameter space at the LHC.

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