arXiv 1403.76292014-03hep-ph

重重力子、自然度和相当大的异常中介

Heavy gravitino, naturalness, and sizable anomaly mediation

Nobuhiro Maekawa, Kenichi Takayama

备注：: 17pages, 5 figures, v2:gluino constraints are added
DOI：: 10.1093/ptep/ptu118

摘要：

考虑了用$m_{3/2}\sim O(100{\rm TeV})$求解引力子问题和用$O(1{\rm TeV})$求解超对称性破缺参数的自然性的情况。我们指出，反常中介作用在一个称为海市蜃楼尺度的尺度上抵消了重整化群对高根诺质量和除终止质量以外的sfermion质量的贡献。这种情况类似于海市蜃楼调解，其中需要特殊的边界条件的超对称性破缺参数，虽然停止质量和向上型希格斯质量，这种取消在海市蜃楼尺度不会发生。尽管没有取消向上型希格斯质量，我们表明，小层次问题变得不那么严重，在这种情况下。这种情况的一个优点是，停止混合参数$A_t$可以更大，因此，较小的停止质量是足够的125 GeV的希格斯粒子。当海市蜃楼尺度在TeV附近时，引力介导引起的超对称性破缺参数在大统一尺度下可以通过TeV尺度实验直接观测到。

英文摘要：

We consider the situation in which $m_{3/2}\sim O(100{\rm TeV})$ for solving the gravitino problem and the other supersymmetry(SUSY) breaking parameters are $O(1{\rm TeV})$ for the naturalness. We point out that the anomaly mediation cancels out the renormalization group contribution to the gaugino masses and the sfermion masses other than the stop masses at a scale which is called the mirage scale. The situation is similar to the mirage mediation, in which special boundary conditions for the SUSY breaking parameters are required, though for the stop masses and the up-type Higgs mass, such cancellation at the mirage scale does not happen. Despite no cancellation for the up-type Higgs mass, we show that the little hierarchy problem becomes less severe in this situation. One advantage of this situation over the mirage mediation is that the stop mixing parameter $A_t$ can be larger and therefore, smaller stop mass is sufficient for 125 GeV Higgs. When the mirage scale is around TeV scale, the SUSY breaking parameters induced by the gravity mediation at the grand unification scale can be observed directly by the TeV scale experiments.

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