Supersymmetry in particle physics

Author(s)

André Paniago Lessa

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin
• Defense date: 2007-02-03

Examining board members

Orlando Luis Goulart Peres; Marcelo Moraes Guzzo; Oscar Jose Pinto Eboli

• Advisor: Orlando Luis Goulart Peres

Abstract

The standard model of elementary particles, based in Lorentz invariance and in the gauge symmetries SU(3)c Ä SU(2)L Ä U(1)Y, was confirmed by all experimental data so far. However there is no evidence that it is the final theory of fundamental interactions. In fact, several theoretical evidences, such as the hierarchy problem, baryogenesis and the number of families and a few experimental data (neutrino masses, dark matter and dark energy) suggest that we should look for physics beyond the Standard Model (SM). Some of these problems are solved in an important class of models, which assume the existence of additional spatial symmetries, called supersymmetry. The objective of this thesis is to study the concept of supersymmetry and its potential relevance to the physics beyond the Standard Model. To understand the principle of supersymmetry we will construct the Minimal Supersymmetric Standard Model (MSSM) and present some of its phenomenological consequences. We will also present the mSUGRA and mGMSB models, as well as some of its properties. In the Appendix we show some complementary information and a parallel work developed during this project (AU)