DE1: Supersymmetric particles in model scenarios preferred by astrophysics
As possible extension of the standard model has been proposed a supersymmetry between bosons and fermions. In supersymmetry every known particle gets a partner whose spin is reduced by
. This kind of supersymmetry is expected by many extension of the standard model, also by super string theories. For an unbroken supersymmetry the properties of particles and associated supersymmetric particles are identical except for the spin. Since no supersymmetric particles have been observed yet, supersymmetry must be broken if it should exist such that the super-partner aquire masses of up to O(TeV). As also the super-partners will decay except for the lightest one (LSP in R particy conservion supersymmetries), the production of such new particles can easily be observed experimentally [1]. The requirement that the LSP constitutes the dark matter leads to restrictions of the model parameters. In one of the allowed parameter ranges the supersymmetric partners of the gauge bosons are much lighter than all other supersymmetric particles. Semi-leptonic decays of these particles lead to signals with many leptons and missing energy. This signature is particularly well suited to separate background events from standard model processes.
References:
As possible extension of the standard model has been proposed a supersymmetry between bosons and fermions. In supersymmetry every known particle gets a partner whose spin is reduced by
. This kind of supersymmetry is expected by many extension of the standard model, also by super string theories. For an unbroken supersymmetry the properties of particles and associated supersymmetric particles are identical except for the spin. Since no supersymmetric particles have been observed yet, supersymmetry must be broken if it should exist such that the super-partner aquire masses of up to O(TeV). As also the super-partners will decay except for the lightest one (LSP in R particy conservion supersymmetries), the production of such new particles can easily be observed experimentally [1]. The requirement that the LSP constitutes the dark matter leads to restrictions of the model parameters. In one of the allowed parameter ranges the supersymmetric partners of the gauge bosons are much lighter than all other supersymmetric particles. Semi-leptonic decays of these particles lead to signals with many leptons and missing energy. This signature is particularly well suited to separate background events from standard model processes.References:
- V. M. Abazov et al. [DØ Collaboration],
Search for supersymmetry via associated production of charginos and neutralinos in final states with three leptons,
Phys. Rev. Lett. 95 (2005) 151805
