Search for Supersymmetry with displaced vertices and muons using the ATLAS detector
department or school: Science, Faculty of
department or school: Physics and Astronomy, Department of
data provider: DSpace
degree campus: UBCV
creator: Chavez Gonzalez, Ricardo
issued: 2017-01-21T04:07:11
issued: 2016
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The results of a search for Supersymmetry (SUSY) using the full 2012 ATLAS dataset with an integrated luminosity of 20.3 fb-¹ at √s = 8 TeV are interpreted and presented in the context of gauge mediated SUSY. No events with at least one long-lived particle that decays at a significant distance from its production point into two muons were observed in data. No vertices passed the selection criteria which is consistent with the Standard Model background of 10-³ vertices. The strongest exclusion is observed between 20 mm and 40 mm, with an upper limit of around 10 fb on the gluino pair production cross-section.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/60268
note: Search for Supersymmetry with displaced vertices andmuons using the ATLAS detectorbyRicardo Chavez GonzalezB.Sc., Tecnolo´gico de Monterrey, 2012A THESIS SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFMaster of ScienceinTHE FACULTY OF GRADUATE AND POSTDOCTORALSTUDIES(Physics)The University of British Columbia(Vancouver)December 2016c© Ricardo Chavez Gonzalez, 2016AbstractThe results of a search for Supersymmetry (SUSY) using the full 2012 ATLASdataset with an integrated luminosity of 20.3 fb−1 at√s = 8 TeV are interpretedand presented in the context of gauge mediated SUSY. No events with at least onelong-lived particle that decays at a significant distance from its production pointinto two muons were observed in data.No vertices passed the selection criteria which is consistent with the StandardModel background of 10−3 vertices. The strongest exclusion is observed between20 mm and 40 mm, with an upper limit of around 10 fb on the gluino pair produc-tion cross-section.iiPrefaceThe ATLAS experiment has more than 3000 members and several research pro-grams, which includes the displaced vertex group. Among other searches in thisgroup like R parity violating supersymmetry, I was involved in the gauge mediatedsupersymmetry model with a neutralino decay into a gravitino and a Z boson withmuons in the final state.I designed analysis scripts to understand several aspects of Monte Carlo samplessuch as vertex selection and reconstruction efficiencies using a cut based approach.The selection criteria used was based on previous versions, which were designedby former UBC Phd student Chang Wei Loh among others.iiiTable of ContentsAbstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iiPreface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iiiTable of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ivList of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viList o…
has type: Thesis/Dissertation
date issued: 2017-02
is shown at: 10.14288/1.0340668
language: eng
degree discipline: Physics
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/60268