Electroweak precision tests on the MSSM and NMSSM constrained at the LHC
Electroweak precision tests on the MSSM and NMSSM constrained at the LHC
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DOI：
10.1007/jhep08(2013)031
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发表时间：
2013-08
影响因子：
5.4
通讯作者：
Sibo Zheng;Y. Yu
中科院分区：
文献类型：
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作者：
Sibo Zheng;Y. Yu
摘要继之前关于超对称电弱精密测试的工作之后，我们继续探索它们对 MSSM 和 NMSSM 的影响，这两者都受到希格斯质量及其在大型强子对撞机上的衰变实验的严格约束。我们采用通用夸克、三代轻子质量以及所有SM费米子的A项。随着 tan β 和/或 γγ 率的增加，我们确定了 MSSM 和 NMSSM 在 S-T 平面中的流动。无论是增加 Rγ 或 tan β 的值，我们发现在 MSSM 中基准点倾向于被推到 99% CL 处的轮廓之外，然而，相反，在 NMSSM 中它们倾向于向 SM 参考点收缩。特别是，我们的基准点表明，参数空间区域中 MSSM 的 EWPT 在 99% CL 处排除 tan β ≳ 50，由于这种行为，参数空间区域预测 Rγ ≳ 1.3。此行为对于区分 NMSSM 和 MSSM 也很有用。副产品是，与 NMSSM 相比，MSSM 中来自中性子和电荷子的贡献应该受到更多抑制。
A bstractFollowing previous works regarding electroweak precision tests in supersymmetry, we continue to explore their implications to the MSSM and NMSSM both of which are tightly constrained by the Higgs mass and its decay experiments at the LHC. We adopt universal squark, slepton mass of three generations, and A-term of all SM fermions. We determine the flows of both MSSM and NMSSM in the S-T plane with increasing tan β and/or γγ rate. Either increasing the value of Rγ or tan β, we find that the benchmark points tend to be pushed outside the contour at 99% CL in the MSSM, however, conversely they tend to shrink towards to the SM reference point in the NMSSM. In particular, our benchmark points suggest that tan β ≳ 50 is excluded at 99% CL by EWPTs for the MSSM in regions of parameter space which predict Rγ ≳ 1.3 due to this behavior. This behavior is also useful to distinguish the NMSSM from the MSSM. A byproduct is that the contributions coming from the neutralinos and charginos should be more suppressed in the MSSM in comparison with the NMSSM.