{"id":{"repo_id":"penn","oai_identifier":"oai:repository.upenn.edu:20.500.14332/62377"},"canonical_url":"https://search.dev.ndltd.org/etd/penn/oai:repository.upenn.edu:20.500.14332/62377","repository":{"repo_id":"penn","name":"University of Pennsylvania","base_url":"https://repository.upenn.edu/server/oai/request"},"display":{"title":"Building the Future: HL-LHC ATLAS Upgrades and Event-Topology-Based Principles to Search for New Physics with Missing Transverse Momentum","abstract":"The planned Large Hadron Collider (LHC) upgrade to the High-Luminosity (HL) LHC imposes significant challenges to the detector hardware and the need for novel analysis strategies to extend the search for new physics. This dissertation presents upgrade projects in both frontiers. In regards to the development of the ATLAS Inner Tracker Strip Detector, the design verification and validation, and probing of the Autonomous Monitoring and Control Chip (AMAC) is presented. Additionally, the radiation tolerance testing of AMAC and a commercial GaN FET are performed in a series of radiation environments. The testing of both devices are performed with device-specific electronics. In the case of GaN FET testing, a dedicated GEANT4-based simulation is developed. It is shown that the functionality of AMAC and GaN FET are minimally affected in radiation heavy environments, satisfying the operation requirements at the HL-LHC. Furthermore, the final AMAC version is projected to experience zero uncorrected single event upsets. An upper limit of $3.25\\times10^{-5}$ single event burnouts per $fb^{-1}$ is placed for GaN FETs operated in the off-state in the forward detector region. In terms of expanding the search for new physics, novel event-topology-based tools are proposed as the bases for a foundational-model framework. These tools include transferable graph neural networks for regression and classification tasks in interaction processes that produce significant missing transverse momentum. The tools are tested on Monte Carlo simulation events prepared for a search for gluino-pair production in $140~\\fb$ of proton proton collision at $\\sqrt{s}=13~\\textrm{TeV}$ with the ATLAS detector. Direct comparison with model-specific search strategies are performed, where comparable results can be achieved in most of the mass space with major improvements in scenarios with compressed mass spectra.","abstract_html":"The planned Large Hadron Collider (LHC) upgrade to the High-Luminosity (HL) LHC imposes significant challenges to the detector hardware and the need for novel analysis strategies to extend the search for new physics. This dissertation presents upgrade projects in both frontiers. In regards to the development of the ATLAS Inner Tracker Strip Detector, the design verification and validation, and probing of the Autonomous Monitoring and Control Chip (AMAC) is presented. Additionally, the radiation tolerance testing of AMAC and a commercial GaN FET are performed in a series of radiation environments. The testing of both devices are performed with device-specific electronics. In the case of GaN FET testing, a dedicated GEANT4-based simulation is developed. It is shown that the functionality of AMAC and GaN FET are minimally affected in radiation heavy environments, satisfying the operation requirements at the HL-LHC. Furthermore, the final AMAC version is projected to experience zero uncorrected single event upsets. An upper limit of <span class=\"etd-inline-math\">3.25\\times10<sup>-5</sup></span> single event burnouts per <span class=\"etd-inline-math\">fb<sup>-1</sup></span> is placed for GaN FETs operated in the off-state in the forward detector region. In terms of expanding the search for new physics, novel event-topology-based tools are proposed as the bases for a foundational-model framework. These tools include transferable graph neural networks for regression and classification tasks in interaction processes that produce significant missing transverse momentum. The tools are tested on Monte Carlo simulation events prepared for a search for gluino-pair production in $140~\\fb$ of proton proton collision at $\\sqrt{s}=13~\\textrm{TeV}$ with the ATLAS detector. Direct comparison with model-specific search strategies are performed, where comparable results can be achieved in most of the mass space with major improvements in scenarios with compressed mass spectra.","abstract_has_math":true,"creators":["Gutierrez Zagazeta, Luis Felipe"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Kroll, Ira Joseph"],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025","date_published":"2025","updated_at":"2026-07-24T03:47:51Z","subjects":["Physics"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://repository.upenn.edu/handle/20.500.14332/62377","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Kroll, Ira Joseph"]},{"key":"dc:creator","label":"Author","values":["Gutierrez Zagazeta, Luis Felipe"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2026-01-29T17:23:25Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-01-29T17:23:25Z"]},{"key":"dc:date.issued","label":"Date","values":["2025"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation/Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://repository.upenn.edu/handle/20.500.14332/62377"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["2025"]},{"key":"dc:description.abstract","label":"Abstract","values":["The planned Large Hadron Collider (LHC) upgrade to the High-Luminosity (HL) LHC imposes significant challenges to the detector hardware and the need for novel analysis strategies to extend the search for new physics. This dissertation presents upgrade projects in both frontiers. In regards to the development of the ATLAS Inner Tracker Strip Detector, the design verification and validation, and probing of the Autonomous Monitoring and Control Chip (AMAC) is presented. Additionally, the radiation tolerance testing of AMAC and a commercial GaN FET are performed in a series of radiation environments. The testing of both devices are performed with device-specific electronics. In the case of GaN FET testing, a dedicated GEANT4-based simulation is developed. It is shown that the functionality of AMAC and GaN FET are minimally affected in radiation heavy environments, satisfying the operation requirements at the HL-LHC. Furthermore, the final AMAC version is projected to experience zero uncorrected single event upsets. An upper limit of $3.25\\times10^{-5}$ single event burnouts per $fb^{-1}$ is placed for GaN FETs operated in the off-state in the forward detector region. In terms of expanding the search for new physics, novel event-topology-based tools are proposed as the bases for a foundational-model framework. These tools include transferable graph neural networks for regression and classification tasks in interaction processes that produce significant missing transverse momentum. The tools are tested on Monte Carlo simulation events prepared for a search for gluino-pair production in $140~\\fb$ of proton proton collision at $\\sqrt{s}=13~\\textrm{TeV}$ with the ATLAS detector. Direct comparison with model-specific search strategies are performed, where comparable results can be achieved in most of the mass space with major improvements in scenarios with compressed mass spectra."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Doctor of Philosophy (PhD)"]},{"key":"dc:title","label":"Title","values":["Building the Future: HL-LHC ATLAS Upgrades and Event-Topology-Based Principles to Search for New Physics with Missing Transverse Momentum"]}]}],"canonical_facts":{"dc:contributor.advisor":["Kroll, Ira Joseph"],"dc:creator":["Gutierrez Zagazeta, Luis Felipe"],"dc:date.accessioned":["2026-01-29T17:23:25Z"],"dc:date.available":["2026-01-29T17:23:25Z"],"dc:date.issued":["2025"],"dc:description":["2025"],"dc:description.abstract":["The planned Large Hadron Collider (LHC) upgrade to the High-Luminosity (HL) LHC imposes significant challenges to the detector hardware and the need for novel analysis strategies to extend the search for new physics. This dissertation presents upgrade projects in both frontiers. In regards to the development of the ATLAS Inner Tracker Strip Detector, the design verification and validation, and probing of the Autonomous Monitoring and Control Chip (AMAC) is presented. Additionally, the radiation tolerance testing of AMAC and a commercial GaN FET are performed in a series of radiation environments. The testing of both devices are performed with device-specific electronics. In the case of GaN FET testing, a dedicated GEANT4-based simulation is developed. It is shown that the functionality of AMAC and GaN FET are minimally affected in radiation heavy environments, satisfying the operation requirements at the HL-LHC. Furthermore, the final AMAC version is projected to experience zero uncorrected single event upsets. An upper limit of $3.25\\times10^{-5}$ single event burnouts per $fb^{-1}$ is placed for GaN FETs operated in the off-state in the forward detector region. In terms of expanding the search for new physics, novel event-topology-based tools are proposed as the bases for a foundational-model framework. These tools include transferable graph neural networks for regression and classification tasks in interaction processes that produce significant missing transverse momentum. The tools are tested on Monte Carlo simulation events prepared for a search for gluino-pair production in $140~\\fb$ of proton proton collision at $\\sqrt{s}=13~\\textrm{TeV}$ with the ATLAS detector. Direct comparison with model-specific search strategies are performed, where comparable results can be achieved in most of the mass space with major improvements in scenarios with compressed mass spectra."],"dc:description.degree":["Doctor of Philosophy (PhD)"],"dc:identifier.uri":["https://repository.upenn.edu/handle/20.500.14332/62377"],"dc:language.iso":["en"],"dc:subject":["Physics"],"dc:title":["Building the Future: HL-LHC ATLAS Upgrades and Event-Topology-Based Principles to Search for New Physics with Missing Transverse Momentum"],"dc:type":["Dissertation/Thesis"]},"updated_at":"2026-07-24T03:47:51Z"}