Models with Inverse Sfermion Mass Hierarchy and Decoupling of the SUSY FCNC Effects

Details Models with Inverse Sfermion Mass Hierarchy and Decoupling of the SUSY FCNC Effects Models with Inverse Sfermion Mass Hierarchy and Decoupling of the SUSY FCNC Effects

2000-04-14

arxiv.org/abs/hep-ph/0004133v1

JHEP0007:048,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, Latex, 1 Postscript figure

Scientific paper

10.1088/1126-6708/2000/07/048

We study the decoupling of the first two squark and slepton families in order to lower the flavour changing neutral current effects. Models with inverse sfermion mass hierarchy based upon gauged U(1) flavour symmetries provide a natural framework where decoupling can be implemented. Decoupling requires a large gap between the Fermi scale and the supersymmetry breaking scale. Maintaining the electroweak symmetry breaking at the Fermi scale requires some fine-tuning that we investigate by solving the two-loop renormalization group equations. We show that the two-loop effects are governed by the anomaly compensated by the Green-Schwarz mechanism and can be determined from the quark and lepton masses. The electroweak breaking constraints lead to a small $\mu$ scenario where the LSP is Higgsino-like.

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