A possible return on race

Third generation superparticles search is one of the main goals of the present LHC activities. Previous LHC data has been especially effective in ruling out the existence of coloured supersymmetric particles (primarily the gluino and the first two generations of s-quarks) with masses below . However, such constraints are relaxed, in some cases by as much as a factor … Continue reading A possible return on race

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Decay chains

As the production of s-quarks and gluinos is favored if kinematically allowed, these particles would start the decay chain in most cases. In the case in which such superparticles were relatively light, the decay chain would be short, and the subsequent possible decays should be few. Instead, if s-quarks and gluinos were very massive, it … Continue reading Decay chains

Production

Production of supersymmetric particles and their subsequent decay chains could occur in different ways depending on the theoretical scenario considered. In the researches for supersymmetric particles, the most frequent choice is to limit the quest to a specific model in which the particles have well-defined decay modes. One of the most promising models to take … Continue reading Production

Supersymmetry searches

As discussed before, SUSY theories introduce the existence of particles at the TeV scale, so these could be already accessible at the . The search for these particles and the determination of their properties, such as mass, spin, etc. and their coupling becomes of central importance in order to verify the existence of new Physics … Continue reading Supersymmetry searches

Implications

Fields, masses and coupling constants appearing in the Lagrangian are perturbatively divergent quantities which become acceptable by renormalization procedures. As a consequence, the new quantities are function of the energy and the functional dependence is governed by the Renormalization Group Equations (RGE). For the gauge coupling constants these equations have the form where is the Callan-Symanzik … Continue reading Implications

The Minimal Supersymmetric extension of the Standard Model (MSSM)

The starting point for the construction of the Lagrangian of a such model is the SUSY Lagrangian, where the gauge invariance with respect to the group of the SM, , has to be imposed. In the minimal hypothesis, each particle included in the SM possesses a unique superpartner, i.e. formally a superfield has to replace … Continue reading The Minimal Supersymmetric extension of the Standard Model (MSSM)

Supersymmetry

Supersymmetry (SUSY) is one of the most compelling possible extensions of the Standard Model of particle physics, and one of the most promising theory candidate for a new principle about Nature that could be discovered at high-energy colliders such as the . The hierarchy problem represents the only indicator of the energy scale in which … Continue reading Supersymmetry