arXiv 0901.02662009-01hep-ph

在MSSM黄金区域发现希格斯粒子的意义

Implications of the Higgs Discovery in the MSSM Golden Region

Ian Low, Shashank Shalgar

备注：: 17 pages and 6 figures; v2: minor revision and added references to match JHEP version
发表信息：: JHEP 0904:091,2009
DOI：: 10.1088/1126-6708/2009/04/091

摘要：

如果在大型强子对撞机上发现了MSSM中最轻的CP偶希格斯玻色子玻色子，就可以同时进行两个测量：希格斯质量m_h和事件速率Bs（gg -> h -> gamma gamma）。我们研究在何种程度上这两种测量的组合将使我们能够提取停止质量矩阵中的参数，包括非对角混合项，重点是MSSM黄金区域，其中停止是轻的，混合是大的。尽管产生截面和衰变振幅对停止扇区以外的超对称参数不敏感，但分支比取决于总衰变宽度，总衰变宽度由Higgs衰变到b夸克的过程决定，对赝标质量m_A和超对称Higgs质量μ都敏感。最后我们发现，在提取停止质量参数时，m_A是一个重要的输入，而非对角混合项的估计则不需要μ的先验知识。

英文摘要：

If the lightest CP-even Higgs boson in the MSSM is discovered at the LHC, two measurements could be made simultaneously: the Higgs mass m_h and the event rate Bs(gg -> h -> gamma gamma). We study to what extent the combination of these two measurements would allow us to extract parameters in the stop mass matrix, including the off-diagonal mixing term, with a focus on the MSSM golden region where the stops are light and the mixing is large. Even though both the production cross-section and the decay amplitude are not sensitive to supersymmetric parameters outside of the stop sector, the branching ratio depends on the total decay width, which is dominated by the Higgs decay to b quarks and sensitive to both the pseudo-scalar mass m_A and the supersymmetric Higgs mass μ. In the end we find m_A is an important input in extracting the stop mass parameters, while a fair estimate of the off-diagonal mixing term could be obtained without prior knowledge of μ.

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