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arXiv 0810.1613hep-ph
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CKM矩阵的超对称重整化及对squark质量矩阵的新约束

Supersymmetric renormalisation of the CKM matrix and new constraints on the squark mass matrices

Andreas Crivellin, Ulrich Nierste

摘要:

我们计算有限重整化的Cabibbo-Kobayashi-Maskawa(CKM)矩阵引起的Gluino-squark图的MSSM与非最小源的味道违反。随后,我们推导出的味小康对角元素的夸克质量矩阵的界限,要求辐射校正CKM元素不超过实验值。如果胶子和夸克的能量大于500 GeV,我们对相应的无量纲量delta^{d LR}_{ij},j>i的约束比从中性流变味过程(FCNC)得到的约束更强。我们的边界|delta^{u LR}_{12}|在900 GeV以上的超伴子质量下,D-D-bar混合的FCNC束缚比FCNC束缚强。我们进一步发现,|delta_{13} ^{u LR}|,其不知道FCNC约束。我们的结果意味着,仍然有可能从软超对称破缺项中产生所有观察到的风味破坏,而不会与当前的FCNC过程数据发生冲突。我们认为,味对称性,使汤川部门的味对角和三线性超对称性破坏的条款是spurion字段打破这种味对称性。我们进一步导出了荷电希格斯玻色子玻色子和电荷玻色子与夸克和方夸克耦合的主要超对称辐射修正。

英文摘要:

We compute the finite renormalisation of the Cabibbo-Kobayashi-Maskawa (CKM) matrix induced by gluino-squark diagrams in the MSSM with non-minimal sources of flavour violation. Subsequently we derive bounds on the flavour-off-diagonal elements of the squark mass matrices by requiring that the radiative corrections to the CKM elements do not exceed the experimental values. Our constraints on the associated dimensionless quantities delta^{d LR}_{ij}, j>i, are stronger than the bounds from flavour-changing neutral current (FCNC) processes if gluino and squarks are heavier than 500 GeV. Our bound on |delta^{u LR}_{12}| is stronger than the FCNC bound from D-D-bar mixing for superpartner masses above 900 GeV. We further find a useful bound on |delta_{13}^{u LR}|, for which no FCNC constraint is known. Our results imply that it is still possible to generate all observed flavour violation from the soft supersymmetry-breaking terms without conflicting with present-day data on FCNC processes. We suggest that a flavour symmetry renders the Yukawa sector flavour-diagonal and the trilinear supersymmetry-breaking terms are the spurion fields breaking this flavour symmetry. We further derive the dominant supersymmetric radiative corrections to the couplings of charged Higgs bosons and charginos to quarks and squarks.

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