Supersymmetric Contributions to $\BB$ and $\KK$ Mixings

Details Supersymmetric Contributions to $\BB$ and $\KK$ Mixings Supersymmetric Contributions to $\BB$ and $\KK$ Mixings

1994-08-04

arxiv.org/abs/hep-ph/9408229v1

Phys.Lett.B337:316-323,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

Plain TeX 11 Pages plus 4 figures appended in a uuencoded compressed PostScript file, CERN-TH.7345/94, TKU-HEP 94/04, CFIF-UTL

Scientific paper

10.1016/0370-2693(94)90981-4

We show that in the supersymmetric standard model (SSM) box diagrams mediated by charginos and up-type squarks may give large contributions to $\BB$ and $\KK$ mixings. This is due to the fact that a heavy top quark mass allows large mass differences among the up-type squarks, which leads to a less efficient cancellation among the different squark diagrams. If the ratio of the vacuum expectation values of the Higgs bosons is of order of unity, box diagrams mediated by charged Higgs bosons also contribute appreciably. For sizable regions of the SSM parameter space, the SSM contributions could be sufficiently large to affect significantly the evaluation of the CKM matrix from the experimental values of the mixing parameter $x_d$ and the $CP$ violation parameter $\epsilon$.

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