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Development of New Approaches to ATLAS Detector Simulation and Dark Matter Searches with Trigger Level Analysis

Marcon, Caterina LU orcid (2021)
Abstract
Elementary particles and their interactions are successfully described by the Standard Model of particle physics (SM). However, it has been observed that extensions Beyond the Standard Model (BSM) are required to account for a large part of yet undiscovered particles and interactions, such as Dark Matter (DM).

To advance the knowledge of the SM and to pursue DM discoveries, CERN has the ambitious plan of further increasing the Large Hadron Collider's (LHC) energy and luminosity, thus reaching unprecedented event rates in the field of collider physics.

This thesis is divided in three parts, dealing with some of the most challenging aspects of the ATLAS experiment at the LHC present and future activities. After a thorough... (More)
Elementary particles and their interactions are successfully described by the Standard Model of particle physics (SM). However, it has been observed that extensions Beyond the Standard Model (BSM) are required to account for a large part of yet undiscovered particles and interactions, such as Dark Matter (DM).

To advance the knowledge of the SM and to pursue DM discoveries, CERN has the ambitious plan of further increasing the Large Hadron Collider's (LHC) energy and luminosity, thus reaching unprecedented event rates in the field of collider physics.

This thesis is divided in three parts, dealing with some of the most challenging aspects of the ATLAS experiment at the LHC present and future activities. After a thorough review of the SM, BSM physics is outlined, with particular attention to DM searches. The second part of this work addresses the issue of coping with the foreseen event rates of the High-Luminosity LHC (HL-LHC) phase. Indeed, optimizations of the existing Geant4 simulation codes are a crucial step to alleviate the need for new and expensive hardware resources. With the objective of improving the efficiency of the simulation tools, an extensive study on different compilers, different optimization levels and different build types is presented. In addition, a preliminary investigation on the geometry description of the ATLAS Transition Radiation Tracker (TRT) modules is discussed. The last part of the thesis covers the DM searches carried out by the ATLAS Trigger-object Level Analysis (TLA) group. These searches are based on the analysis of the invariant mass spectrum of di-jet events and, during LHC Run 2, have been performed at energies in the 450-1800 GeV range (integrated luminosity up to 29.3 fb-1 and center of mass energy of 13 TeV). After a review of the TLA studies, a preliminary investigation on the performance of Bayesian and Frequentist statistical tools is presented. In particular, the attention is focused on the interpretation and handling of systematic uncertainties both on background and DM signals. This is of particular importance in the process of finding localized excesses, which can indicate the existence of DM signals, and setting limits on the DM event cross sections. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Dr. Claudio, Grandi, Istituto Nazionale di Fisica Nucleare, Italy
organization
publishing date
type
Thesis
publication status
published
subject
keywords
particle physics, computing, Geant4, optimizations, dark matter, di-jet resonances, ATLAS, LHC, Fysicumarkivet A:2021:Marcon
pages
206 pages
publisher
Lund University
defense location
Fysiska institutionen, Sal B. Join via zoom: https://lu-se.zoom.us/j/65919237400?pwd=ZGp2ZFkvSUpvbjl3aitSK21rTE1XUT09 passcode: 065631
defense date
2021-10-29 13:15:00
ISBN
978-91-7895-884-9
978-91-7895-883-2
project
Development of New Approaches to ATLAS Detector Simulation and Dark Matter Searches with Trigger Level Analysis
language
English
LU publication?
yes
id
b843b74d-1ad7-4684-ba59-e3dde7670dfb
date added to LUP
2021-09-28 21:55:03
date last changed
2023-05-31 11:24:40
@phdthesis{b843b74d-1ad7-4684-ba59-e3dde7670dfb,
  abstract     = {{Elementary particles and their interactions are successfully described by the Standard Model of particle physics (SM). However, it has been observed that extensions Beyond the Standard Model (BSM) are required to account for a large part of yet undiscovered particles and interactions, such as Dark Matter (DM).<br/><br/>To advance the knowledge of the SM and to pursue DM discoveries, CERN has the ambitious plan of further increasing the Large Hadron Collider's (LHC) energy and luminosity, thus reaching unprecedented event rates in the field of collider physics.<br/><br/>This thesis is divided in three parts, dealing with some of the most challenging aspects of the ATLAS experiment at the LHC present and future activities. After a thorough review of the SM, BSM physics is outlined, with particular attention to DM searches. The second part of this work addresses the issue of coping with the foreseen event rates of the High-Luminosity LHC (HL-LHC) phase. Indeed, optimizations of the existing Geant4 simulation codes are a crucial step to alleviate the need for new and expensive hardware resources. With the objective of improving the efficiency of the simulation tools, an extensive study on different compilers, different optimization levels and different build types is presented. In addition, a preliminary investigation on the geometry description of the ATLAS Transition Radiation Tracker (TRT) modules is discussed. The last part of the thesis covers the DM searches carried out by the ATLAS Trigger-object Level Analysis (TLA) group. These searches are based on the analysis of the invariant mass spectrum of di-jet events and, during LHC Run 2, have been performed at energies in the 450-1800 GeV range (integrated luminosity up to 29.3 fb-1 and center of mass energy of 13 TeV). After a review of the TLA studies, a preliminary investigation on the performance of Bayesian and Frequentist statistical tools is presented. In particular, the attention is focused on the interpretation and handling of systematic uncertainties both on background and DM signals. This is of particular importance in the process of finding localized excesses, which can indicate the existence of DM signals, and setting limits on the DM event cross sections.}},
  author       = {{Marcon, Caterina}},
  isbn         = {{978-91-7895-884-9}},
  keywords     = {{particle physics; computing; Geant4; optimizations; dark matter; di-jet resonances; ATLAS; LHC; Fysicumarkivet A:2021:Marcon}},
  language     = {{eng}},
  publisher    = {{Lund University}},
  school       = {{Lund University}},
  title        = {{Development of New Approaches to ATLAS Detector Simulation and Dark Matter Searches with Trigger Level Analysis}},
  url          = {{https://lup.lub.lu.se/search/files/103174556/MarconPhDThesis.pdf}},
  year         = {{2021}},
}