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arXiv 0910.4058hep-ph
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SUSY A4模型中的真空对准

Vacuum Alignment in SUSY A4 Models

Ferruccio Feruglio, Claudia Hagedorn, Luca Merlo

备注：
23 pages; added a new section on the relation to Supergravity; version accepted for publication in JHEP
发表信息：
JHEP 1003:084,2010
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摘要：

本文讨论了具有自发破缺味对称性的超对称模型中存在软超对称性破缺项时的真空排列。我们表明，软超对称性破缺项的列入可以引起非零真空期望值（VEVs）的辅助组件的flavon字段。这些非零VEV可能对此类模型的现象学产生重要影响，因为它们可以对左右（RL）类型的sfermion软质量矩阵产生额外的味违反贡献。我们对一类超对称A4模型进行了显式计算，预测了轻子扇区中的三双峰混合。味对称性破缺部门描述的flavon和驾驶超多重态。我们发现非零VEV的辅助组件的flavon字段和驱动字段的顺序为m_{SUSY} x和m_{SUSY}的标量分量<phi>，分别。因此，m_{SUSY}是通用的软超对称性破缺标度，其预期为约1 TeV，并且<phi>是黄子场的标量分量的VEV。这些VEV的另一个影响可以是产生μ项。

英文摘要：

In this note we discuss the vacuum alignment in supersymmetric models with spontaneously broken flavour symmetries in the presence of soft supersymmetry (SUSY) breaking terms. We show that the inclusion of soft SUSY breaking terms can give rise to non-vanishing vacuum expectation values (VEVs) for the auxiliary components of the flavon fields. These non-zero VEVs can have an important impact on the phenomenology of this class of models, since they can induce an additional flavour violating contribution to the sfermion soft mass matrix of right-left (RL) type. We carry out an explicit computation in a class of SUSY A4 models predicting tri-bimaximal mixing in the lepton sector. The flavour symmetry breaking sector is described in terms of flavon and driving supermultiplets. We find non-vanishing VEVs for the auxiliary components of the flavon fields and for the scalar components of the driving fields which are of order m_{SUSY} x <phi> and m_{SUSY}, respectively. Thereby, m_{SUSY} is the generic soft SUSY breaking scale which is expected to be around 1 TeV and <phi> is the VEV of scalar components of the flavon fields. Another effect of these VEVs can be the generation of a mu term.

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