{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/130095"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/130095","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Searches for supersymmetric particles in leptonic final states with the ATLAS detector","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","abstract_has_math":false,"creators":["Fan, Cunwei"],"institution":"University of Illinois Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Hooberman, Benjamin H.","El-Khadra, Aida","Cooper, Lance","Noronha, Jorge"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-07-14","date_published":"2025-07-14","updated_at":"2026-07-22T22:25:06Z","subjects":["Long-lived Particle","Atlas","Hough Transfrom","Susy"],"languages":["en","eng"],"rights":["Copyright 2025 Cunwei Fan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/130095","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hooberman, Benjamin H.","El-Khadra, Aida","Cooper, Lance","Noronha, Jorge"]},{"key":"dc:creator","label":"Author","values":["Fan, Cunwei"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-07-14","2025-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Long-lived Particle","Atlas","Hough Transfrom","Susy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2025 Cunwei Fan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/130095"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","The student, Cunwei Fan, accepted the attached license on 2025-07-10 at 19:55.","The student, Cunwei Fan, submitted this Dissertation for approval on 2025-07-10 at 20:03.","This Dissertation was approved for publication on 2025-07-14 at 13:39.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22495 on 2025-10-25 at 15:30:58","This thesis presents a search for displaced leptons, a characteristic signature of long-lived particles (LLPs), using data collected by the ATLAS detector at the LHC. The analysis targets leptonic final states in proton--proton collisions from Run~2 and early Run~3, leveraging newly developed LRT-based triggers and a data-driven background estimation strategy. No significant excess over the Standard Model background is observed, and exclusion limits are set on signal model parameters such as slepton mass, lifetime for two representative supersymmetric (SUSY) scenarios. Beyond the search itself, this thesis contributes to the broader experimental toolkit for LLP detection. To enable real-time identification of displaced tracks at the High-Luminosity LHC, a Hough Transform-based algorithm is implemented on an FPGA, providing fast online pattern recognition capabilities for track triggering. Additionally, a GRU-based recurrent neural network is developed to improve prompt lepton identification, particularly at low transverse momentum, surpassing traditional cut-based methods. Together, these efforts enhance the ATLAS experiment’s sensitivity to long-lived particles and provide essential algorithmic tools for future LLP searches across a range of theoretical models."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Searches for supersymmetric particles in leptonic final states with the ATLAS detector"]}]}],"canonical_facts":{"dc:contributor":["Hooberman, Benjamin H.","El-Khadra, Aida","Cooper, Lance","Noronha, Jorge"],"dc:creator":["Fan, Cunwei"],"dc:date":["2025-07-14","2025-08"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","The student, Cunwei Fan, accepted the attached license on 2025-07-10 at 19:55.","The student, Cunwei Fan, submitted this Dissertation for approval on 2025-07-10 at 20:03.","This Dissertation was approved for publication on 2025-07-14 at 13:39.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22495 on 2025-10-25 at 15:30:58","This thesis presents a search for displaced leptons, a characteristic signature of long-lived particles (LLPs), using data collected by the ATLAS detector at the LHC. The analysis targets leptonic final states in proton--proton collisions from Run~2 and early Run~3, leveraging newly developed LRT-based triggers and a data-driven background estimation strategy. No significant excess over the Standard Model background is observed, and exclusion limits are set on signal model parameters such as slepton mass, lifetime for two representative supersymmetric (SUSY) scenarios. Beyond the search itself, this thesis contributes to the broader experimental toolkit for LLP detection. To enable real-time identification of displaced tracks at the High-Luminosity LHC, a Hough Transform-based algorithm is implemented on an FPGA, providing fast online pattern recognition capabilities for track triggering. Additionally, a GRU-based recurrent neural network is developed to improve prompt lepton identification, particularly at low transverse momentum, surpassing traditional cut-based methods. Together, these efforts enhance the ATLAS experiment’s sensitivity to long-lived particles and provide essential algorithmic tools for future LLP searches across a range of theoretical models."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/130095"],"dc:language":["en","eng"],"dc:rights":["Copyright 2025 Cunwei Fan"],"dc:subject":["Long-lived Particle","Atlas","Hough Transfrom","Susy"],"dc:title":["Searches for supersymmetric particles in leptonic final states with the ATLAS detector"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:06Z"}