Trabajo de grado - Maestría
Feasibility study on the production of Z' bosons through the fusion of top-quark pairs at the LHC
Fecha
2022-06-10Registro en:
instname:Universidad de los Andes
reponame:Repositorio Institucional Séneca
Autor
Sánchez Alarcón, Manuel Fernando
Institución
Resumen
In this work, we explore the hypothetical production of a Z' boson, resulting from the fusion of a top anti-top quark pair, and where the Z' decays to a bottom anti-bottom quark pair. The top pair results from the decays of two gluons, each decaying to a top-anti-top pair. The analysis focuses in final states with semi-leptonic decays of the associated top pair not involved in the Z' fusion process. To simulate the proton-proton collisions at the Large Hadron Collider (LHC) and the subsequent production of signal and background processes, the associated particles from fragmentations of quarks and gluons due to the strong force, and the interactions of particles with a detector volume, the analysis use the software MadGraph, Pythia and DELPHES, respectively. MadGraph is an event generators based on Monte-Carlo (MC) methods that simulates proton-proton collisions in order to produce specific unweighted events indicated by the user. Pythia makes use of MadGraph events and hadronize them. Hadronization is understood as the process in which hadrons are formed out of gluons and quarks, as a consequence of the nature of the strong force, described through Quantum Chromodynamics (QCD) theory. Finally, DELPHES simulate detector physics in order to have more realistic results. Once the events have been generated, the output is imported to a Python script, which makes use of pyROOT for the corresponding statistical study and for an event discrimination performed with algorithms such as logistic regression and gradient boosting. We propose to perform a feasibility study with simulation of the hypocritical production of the process just described, to determine the expected experimental sensitivity to prove this production mechanism for Z' bosons at the LHC