A Monte Carlo study of long-lived particles (Neutralinos) in CMS at LHC

In this study after giving a summary of Standard Model (SM) which isthe best theory to explain the fundamental particles and the interactions betweenthem upto now, the Minimal Supersymmetric Standard Model (MSSM),a preferred extension of SM was given in detailed. The simulation of neutralinoswhich are considered to be one of the particles of structure of the dark matter andcould not be explained by SM, creates the objective of this thesis. Simulationshave been performed for a center of mass energy ps= 10 TeV and neutralinomass M0 = 165 GeV. One hundred events have been generated using the MonteCarlo simulation method. A pair of neutralinos were produced and each of themwas decayed into two jets. Two parameters have been used to investigate neutrolinosignatures. One of parameters was muon decay vertex coming from decayprocess in four jets up to 3 cm in the inner tracker. Reconstructed muon datahave been checked for all directions, then demonstrated in these directions. Theother parameter was missing transverse energy coming from jets transversingCalorimeter. The related graphs have been plotted for these particles.