Stability of the CMSSM against sfermion VEVs
Stability of the CMSSM against sfermion VEVs
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DOI：
10.1007/jhep12(2013)103
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发表时间：
2013-09
影响因子：
5.4
通讯作者：
J. E. Camargo-Molina;B. O'Leary;W. Porod;F. Staub
中科院分区：
文献类型：
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作者：
J. E. Camargo-Molina;B. O'Leary;W. Porod;F. Staub
最近在大型强子对撞机实验中发现的希格斯玻色子对超对称模型有着重要的意义。特别是，在限制模型的上下文中，如超引力启发的约束最小超对称标准模型，人们发现参数空间中的首选区域具有大的软超对称性破坏三线性耦合。除了SU（2）L× U（1）Y的正确破缺之外，这可能会产生电荷和/或色破缺极小值。我们调查的稳定性，在这个模型中的参数点，对隧道可能更深的颜色和/或电荷打破最小值的单圈有效电位。我们发现，参数空间允许的区域与光态或光停止严重限制的要求，没有更深的最小值，参数空间仍然是相当严格的限制，即使不太严格的要求，隧道时间正常电弱对称性破缺真空是超过五分之一的年龄已知的宇宙。我们还发现，“拇指规则”的条件下拉格朗日参数的基础上，在树级潜力的特定方向是有限的使用。
The recent discovery of a Higgs boson by the LHC experiments has pro-found implications for supersymmetric models. In particular, in the context of restricted models, such as the supergravity-inspired constrained minimal supersymmetric standard model, one finds that preferred regions in parameter space have large soft supersymmetry-breaking trilinear couplings. This potentially gives rise to charge-and/or color-breaking minima besides those with the correct breaking of SU (2) L× U (1) Y. We investigate the stability of parameter points in this model against tunneling to possible deeper color-and/or charge-breaking minima of the one-loop effective potential. We find that allowed regions of the parameter space with light staus or with light stops are seriously constrained by the requirement that there are no deeper minima, and the parameter space is still quite constrained even by the less strict requirement that the tunneling time out of the normal electroweak-symmetry-breaking vacuum is more than a fifth of the age of the known Universe. We also find that “thumb rule” conditions on Lagrangian parameters based on specific directions in the tree-level potential are of limited use.