Ultrarelativistic heavy-ion collision experiments

Why to make particles collide? Okay, if you're on this website you probably do not need to know this and you already have an idea of the physics studied at the and by other particles accelerator experiments. Strongly interacting particles at very high temperatures and energy densities compose a new state of matter called quark-gluon … Continue reading Ultrarelativistic heavy-ion collision experiments

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

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

The Higgs mechanism

The simplest way to implement the SSB in the electroweak theory is achieved by adding the Higgs field, a complex scalar isospin doublet with four degrees of freedom, Without affecting the gauge invariance, it is possible to add to the Lagrangian of the electroweak interaction (*) the term which indicates the SSB, with  and in the potential explicited … Continue reading The Higgs mechanism

Particles and forces

Beyond the force that holds us back in bed in the morning, there are other four fundamental forces, in Nature. At the present state of our knowledge, Nature is presented as the result of the composition of the four fundamental interactions (electromagnetic, weak, strong and gravitational) with a set of elementary particles which can be classified according … Continue reading Particles and forces