{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/104862"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/104862","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Searching for exotic Higgs boson decays using a low mass double b-tagger","abstract":"This dissertation presents the development, calibration, and application of a newly developed double b-tagger for use in the context of exotic Higgs decays. After the discovery of the Higgs boson at the Large Hadron Collider, an effort to measure its properties in detail has ensued. Current measurements only constrain non- Standard Model or “exotic” Higgs decays to about < 26%. Allowing the Higgs to decay into new particles could remedy some outstanding problems in the Standard Model like dark matter or the matter/anti-matter asymmetry in the universe. Thus, an exciting window of opportunity exists for new physics. The exotic Higgs decays investigated in this work have the Higgs decay into a new spin-zero particle, a. The a-boson then decays into a pair of b-quarks. For low a masses, the b-quarks from the same parent a tend to be collimated. This results in signatures that previous ATLAS reconstruction techniques could not efficiently find. With a newly developed tagger, the H → 2a → 4b search in the low mass regime was able to be performed.","abstract_html":"This dissertation presents the development, calibration, and application of a newly developed double b-tagger for use in the context of exotic Higgs decays. After the discovery of the Higgs boson at the Large Hadron Collider, an effort to measure its properties in detail has ensued. Current measurements only constrain non- Standard Model or “exotic” Higgs decays to about &lt; 26%. Allowing the Higgs to decay into new particles could remedy some outstanding problems in the Standard Model like dark matter or the matter/anti-matter asymmetry in the universe. Thus, an exciting window of opportunity exists for new physics. The exotic Higgs decays investigated in this work have the Higgs decay into a new spin-zero particle, a. The a-boson then decays into a pair of b-quarks. For low a masses, the b-quarks from the same parent a tend to be collimated. This results in signatures that previous ATLAS reconstruction techniques could not efficiently find. With a newly developed tagger, the H → 2a → 4b search in the low mass regime was able to be performed.","abstract_has_math":false,"creators":["Khader, Mazin Woodrow"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Martinez Outschoorn, Verena I","Pitts, Kevin T.","Shelton, Jessie","Cooper, Stephen L"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-08-23T19:55:44Z","date_published":"2019-08-23T19:55:44Z","updated_at":"2026-07-22T22:24:42Z","subjects":["Higgs","Exotic Higgs","High Energy Physics","Particle Physics, Associated Production","Double B-Tagging","g->bb Calibration","Merged Search"],"languages":["en"],"rights":["Copyright 2019 Mazin Woodrow Khader"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/104862","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Martinez Outschoorn, Verena I","Pitts, Kevin T.","Shelton, Jessie","Cooper, Stephen L"]},{"key":"dc:creator","label":"Author","values":["Khader, Mazin Woodrow"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-08-23T19:55:44Z","2019-04-19","2019-05"]},{"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 at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Higgs","Exotic Higgs","High Energy Physics","Particle Physics, Associated Production","Double B-Tagging","g->bb Calibration","Merged Search"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Mazin Woodrow Khader"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/104862"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This dissertation presents the development, calibration, and application of a newly developed double b-tagger for use in the context of exotic Higgs decays. After the discovery of the Higgs boson at the Large Hadron Collider, an effort to measure its properties in detail has ensued. Current measurements only constrain non- Standard Model or “exotic” Higgs decays to about < 26%. Allowing the Higgs to decay into new particles could remedy some outstanding problems in the Standard Model like dark matter or the matter/anti-matter asymmetry in the universe. Thus, an exciting window of opportunity exists for new physics. The exotic Higgs decays investigated in this work have the Higgs decay into a new spin-zero particle, a. The a-boson then decays into a pair of b-quarks. For low a masses, the b-quarks from the same parent a tend to be collimated. This results in signatures that previous ATLAS reconstruction techniques could not efficiently find. With a newly developed tagger, the H → 2a → 4b search in the low mass regime was able to be performed.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-08-22 without embargo terms","The student, Mazin Khader, accepted the attached license on 2019-04-17 at 19:38.","The student, Mazin Khader, submitted this Dissertation for approval on 2019-04-17 at 19:53.","This Dissertation was approved for publication on 2019-04-19 at 11:37.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13727 on 2019-08-22 at 14:44:41","Made available in DSpace on 2019-08-23T19:55:44Z (GMT). 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Current measurements only constrain non- Standard Model or “exotic” Higgs decays to about < 26%. Allowing the Higgs to decay into new particles could remedy some outstanding problems in the Standard Model like dark matter or the matter/anti-matter asymmetry in the universe. Thus, an exciting window of opportunity exists for new physics. The exotic Higgs decays investigated in this work have the Higgs decay into a new spin-zero particle, a. The a-boson then decays into a pair of b-quarks. For low a masses, the b-quarks from the same parent a tend to be collimated. This results in signatures that previous ATLAS reconstruction techniques could not efficiently find. With a newly developed tagger, the H → 2a → 4b search in the low mass regime was able to be performed.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-08-22 without embargo terms","The student, Mazin Khader, accepted the attached license on 2019-04-17 at 19:38.","The student, Mazin Khader, submitted this Dissertation for approval on 2019-04-17 at 19:53.","This Dissertation was approved for publication on 2019-04-19 at 11:37.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13727 on 2019-08-22 at 14:44:41","Made available in DSpace on 2019-08-23T19:55:44Z (GMT). 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