Natural ranges of supersymmetric signals

Details Natural ranges of supersymmetric signals Natural ranges of supersymmetric signals

1998-11-18

arxiv.org/abs/hep-ph/9811386v2

Nucl.Phys.B550:3-31,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 8 figures. Final version

Scientific paper

10.1016/S0550-3213(99)00153-4

The LEP2 experiments pose a serious naturalness problem for supersymmetric models. The problem is stronger in gauge mediation than in supergravity models. Particular scenarios, like electroweak baryogenesis or gauge mediation with light messengers, are strongly disfavoured. Searching a theoretical reason that naturally explains why supersymmetry has not been found poses strong requests on model building. If instead an unlikely (p\approx 5%) numerical accident has hidden supersymmetry to LEP2, we compute the naturalness distribution of values of allowed sparticle masses and supersymmetric loop effects. We find that b to s gamma remains a very promising signal of minimal supersymmetry even if there is now a 20% (4%) probability that coloured particles are heavier than 1 TeV (3 TeV). We study how much other effects are expected to be detectable.

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