修正的sfermion普适性和自发CP破坏的CEDM约束
CEDM constraints on modified sfermion universality and spontaneous CP violation
摘要:
我们讨论了修改sfermion软质量普适性时出现的超对称CP问题。考虑到第三代SU(5)十重态的自然性,我们将其置于弱标度。其他sfermion质量被假定为是普遍的和TeV的规模,以削弱味道改变中性电流过程和电偶极矩(EDM)的限制。然而,这种修改一般诱导太大的上夸克色EDM(CEDM)通过弱标度停止环。为了抑制这种CEDM,我们提出了某种类型的味结构,其中上夸克扇区的参数是真实的,而下夸克和带电轻子扇区的参数在GUT尺度下是复杂的。结果表明,在此设置中,上夸克CEDM可以被抑制在当前和未来的实验有其灵敏度的范围内。我们简要地说明了在具有SU(2)味对称性的E $_6$ SUSY大统一理论中,通过自发的CP破坏,可以简单地实现这些特殊形式的实上夸克扇区的修正的sfermion普适性.
英文摘要:
We discuss the supersymmetric CP problem that arises when the sfermion soft mass universality is modified. We place the 3rd generation SU(5) ten-plet sfermion masses in the weak scale in view of the naturalness. The other sfermion masses are assumed to be universal and a TeV scale in order to weaken the flavor changing neutral current processes and electric dipole moment (EDM) constraints. However this modification generically induces too large up quark chromo-EDM (CEDM) via the weak scale stop loop. In order to suppress this CEDM, we propose certain type of flavor structure where the parameters of the up-(s)quark sector are real whereas those of the down-(s)quark and the charged (s)lepton sectors are complex at the GUT scale. It is shown that, in this set up, up quark CEDM can be suppressed within the range where the current and future experiments have their sensitivity. We briefly illustrate the simple realization of these particular forms of the modified sfermion universality with real up-(s)quark sector by spontaneous CP violation in E$_6$ SUSY GUT with SU(2) flavor symmetry.
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