The light stop window

The Light Higgsino-Gaugino Window

Supersymmetric models are typically taken to have p parameter and all soft supersymmetry breaking parameters at or near the weak scale. We point out that a small window of allowed values exists in which ~1 and the electroweak gaugino masses are in the few GeV range. Such models naturally solve the supersymmetry CP problem, can reduce the discrepancy in &,, and suppress proton decay. In this win...

Opening the window of opportunity: encouraging patients to stop smoking.

Light Stop and the b → sγ Process

A constraint from b → sγ process to the minimal supersymmetric standard model is derived in the light stop region where the coupling between the lighter stop and the Z boson vanishes due to the left-right mixing of the stop states. It is pointed out that although some region in the parameter space is excluded from this process there remains a large parameter space where the amplitude of the b →...

The Light Gluino Mass Window Revisited

The precise measurements of the “electroweak observables” performed at LEP and SLC are well consistent with the standard model predictions. Deviations from the standard model arising from vacuum polarization diagrams (also called “weak loop corrections”) have been constrained in a model-independent manner with the ε formalism. Within the same formalism, additional deviations from new physics pr...

The light sbottom mass window revisited

An apparent excess of more than 4σ in the e+e− → hadron cross section for centre-of-mass energies between 20 to 209GeV has recently been reported. This excess was found to be well reproduced over the whole energy range by the production of a pair of sbottoms with mass 6GeV/c2 and mixing angle cos θmix = 0.18. It is shown here that the reported excess essentially vanishes after the implementatio...