Supersymmetric contributions to rare kaon decays: beyond the single mass-insertion approximation

Details Supersymmetric contributions to rare kaon decays: beyond the single mass-insertion approximation Supersymmetric contributions to rare kaon decays: beyond the single mass-insertion approximation

1998-08-31

arxiv.org/abs/hep-ph/9808487v1

JHEP 9809:009,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, JHEP style, 21 pages, 2 figures

Scientific paper

10.1088/1126-6708/1998/09/009

We analyze the contributions to rare kaon decays mediated by flavor-changing Z-penguin diagrams in a generic low-energy supersymmetric extension of the Standard Model. In order to perform a model-independent analysis we expand the squark mass matrices around the diagonal, following the so called mass-insertion approximation. We argue that in the present case it is necessary to go up to the second order in this expansion to take into account all possible large effects. The current bounds on such second-order term, which was neglected in previous analyses, are discussed in detail and the corresponding upper bounds for the rare kaon decay rates are derived. As a result, we show that supersymmetric effects could lead to large enhancements of K -> pi nu{\bar nu} and K_L -> pi^0 e^+ e^- branching ratios.

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