Collider signals from slow decays in supersymmetric models with an intermediate-scale solution to the mu problem

Details Collider signals from slow decays in supersymmetric models with an intermediate-scale solution to the mu problem Collider signals from slow decays in supersymmetric models with an intermediate-scale solution to the mu problem

2000-05-12

arxiv.org/abs/hep-ph/0005116v1

Phys.Rev. D62 (2000) 095008

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, LaTeX, 4 figures

Scientific paper

10.1103/PhysRevD.62.095008

The problem of the origin of the mu parameter in the Minimal Supersymmetric Standard Model can be solved by introducing singlet supermultiplets with non-renormalizable couplings to the ordinary Higgs supermultiplets. The Peccei-Quinn symmetry is broken at a scale which is the geometric mean between the weak scale and the Planck scale, yielding a mu term of the right order of magnitude and an invisible axion. These models also predict one or more singlet fermions which have electroweak-scale masses and suppressed couplings to MSSM states. I consider the case that such a singlet fermion, containing the axino as an admixture, is the lightest supersymmetric particle. I work out the relevant couplings in several of the simplest models of this type, and compute the partial decay widths of the next-to-lightest supersymmetric particle involving leptons or jets. Although these decays will have an average proper decay length which is most likely much larger than a typical collider detector, they can occasionally occur within the detector, providing a striking signal. With a large sample of supersymmetric events, there will be an opportunity to observe these decays, and so gain direct information about physics at very high energy scales.

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