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arXiv 1107.3105hep-ph
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具有低胶子质量的弦驱动重标量谱的味问题:G2-MSSM情况

Flavour issues for string-motivated heavy scalar spectra with a low gluino mass: the G2-MSSM case

Kenji Kadota, Gordon Kane, Joern Kersten, Liliana Velasco-Sevilla

摘要:

近年来,人们已经了解到,如果我们的世界是用超对称破缺和稳定模量的紧致弦或M理论来描述的,那么在短距离弦尺度下,标量超伴体质量和三线性耦合一般都应该大于20 TeV。在这里,我们研究的影响,有点一般,也详细的一个特定的实现(紧化的M-理论的G_2流形),那里有重要的知识的超势和规范动力学函数,和轻胶子。在某种意义上,这产生了最小味道破坏的紫外线完成。味破坏源于标量质量矩阵的非对角元和非万有对角元、三线性耦合以及重整化群的运行。我们还研究了标量势的稳定边界。虽然重标量本身并不能保证没有味道问题,但我们的研究表明,具有重标量和轻胶子的模型可以避免这些问题。

英文摘要:

In recent years it has been learned that scalar superpartner masses and trilinear couplings should both generically be larger than about 20 TeV at the short distance string scale if our world is described by a compactified string or M-theory with supersymmetry breaking and stabilized moduli. Here we study implications of this, somewhat generally and also in detail for a particular realization (compactification of M-theory on a G_2 manifold) where there is significant knowledge of the superpotential and gauge kinetic function, and a light gluino. In a certain sense this yields an ultraviolet completion of minimal flavour violation. Flavour violation stems from off-diagonal and non-universal diagonal elements of scalar mass matrices and trilinear couplings, and from renormalization group running. We also examine stability bounds on the scalar potential. While heavy scalars alone do not guarantee the absence of flavour problems, our studies show that models with heavy scalars and light gluinos can be free from such problems.

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