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arXiv 1402.1735hep-ph
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MSSM中的一般重点

General Focus Point in the MSSM

Antonio Delgado, Mariano Quiros, Carlos Wagner

摘要:

标准模型(SM)的最小超对称扩展是超越SM的物理学的一个很好的动机场景,它允许对理论进行微扰描述,直到大统一尺度的量级,规范耦合统一。Higgs质量参数对紫外物理不敏感,只对软超对称破缺参数的尺度敏感。目前的对撞机界限表明,这些参数的特征值可能会显着大于弱标度。然而,大的软破缺参数会引起对希格斯质量参数的大的辐射修正,因此只有通过全纯μ参数的平方和希格斯超对称破缺平方质量参数之间的微调抵消才能获得适当的电弱标度。这只能在标量和高根诺质量参数之间存在相关性时才能避免,这样希格斯超对称破缺参数就保持在弱标度的量级。发生这种情况的规模被称为焦点。在这篇文章中,我们定义了发生这种情况所需的一般条件,对于超对称性破缺传输到可观察扇区的信使尺度的不同值,以及对于sfermion,gaugino和Higgs质量参数的任意边界条件。具体的超对称性破缺的情况下,这些相关性可能发生的也进行了讨论。

英文摘要:

The minimal supersymmetric extension of the Standard Model (SM) is a well motivated scenario for physics beyond the SM, which allows a perturbative description of the theory up to scales of the order of the Grand Unification scale, where gauge couplings unify. The Higgs mass parameter is insensitive to the ultraviolet physics and is only sensitive to the scale of soft supersymmetry breaking parameters. Present collider bounds suggest that the characteristic values of these parameters may be significantly larger than the weak scale. Large values of the soft breaking parameters, however, induce large radiative corrections to the Higgs mass parameter and therefore the proper electroweak scale may only be obtained by a fine tuned cancellation between the square of the holomorphic μ-parameter and the Higgs supersymmetry breaking square mass parameter. This can only be avoided if there is a correlation between the scalar and gaugino mass parameters, such that the Higgs supersymmetry breaking parameter remains of the order of the weak scale. The scale at which this happens is dubbed as focus point. In this article, we define the general conditions required for this to happen, for different values of the messenger scale at which supersymmetry breaking is transmitted to the observable sector, and for arbitrary boundary conditions of the sfermion, gaugino, and Higgs mass parameters. Specific supersymmetry breaking scenarios in which these correlations may occur are also discussed.

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