{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/109313"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/109313","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Probing the flavor dependence of proton's light-quark sea in the SeaQuest experiment at Fermilab","abstract":"Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\\bar{d}/\\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\\bar{d}/\\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH$_2$) and deuterium (LD$_2$) targets, the SeaQuest experiment probes the $\\bar{d}/\\bar{u}$ ratio up to $x\\approx 0.45$. Data collection has been completed and the status of data analysis for SeaQuest is presented. Two different methods for extracting the LD$_2$/LH$_2$ Drell-Yan cross section ratios for $0.1\\leq x \\leq 0.45$ are presented and the results are in reasonable agreement. These ratios allow for the extraction of $\\bar{d}/\\bar{u}$ revealing an absence of the drop at large $x$ reported earlier by E866. Results from this work are compared with various theoretical models for the flavor structure of the nucleon sea.","abstract_html":"Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\\bar{d}/\\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\\bar{d}/\\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH<span class=\"etd-inline-math\"><sub>2</sub></span>) and deuterium (LD<span class=\"etd-inline-math\"><sub>2</sub></span>) targets, the SeaQuest experiment probes the $\\bar{d}/\\bar{u}$ ratio up to $x\\approx 0.45$. Data collection has been completed and the status of data analysis for SeaQuest is presented. Two different methods for extracting the LD<span class=\"etd-inline-math\"><sub>2</sub></span>/LH<span class=\"etd-inline-math\"><sub>2</sub></span> Drell-Yan cross section ratios for $0.1\\leq x \\leq 0.45$ are presented and the results are in reasonable agreement. These ratios allow for the extraction of $\\bar{d}/\\bar{u}$ revealing an absence of the drop at large $x$ reported earlier by E866. Results from this work are compared with various theoretical models for the flavor structure of the nucleon sea.","abstract_has_math":true,"creators":["Dove, Jason"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Peng, Jen-Chieh","Makins, Naomi","Shelton, Jessie","Abbamonte, Peter"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-03-05T21:33:11Z","date_published":"2021-03-05T21:33:11Z","updated_at":"2026-07-22T22:24:50Z","subjects":["nuclear","physics","proton","fixed target","parton distribution function","Fermilab","deep-inelastic scattering","E906","SeaQuest"],"languages":["en"],"rights":["Copyright 2020 Jason Dove"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/109313","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Peng, Jen-Chieh","Makins, Naomi","Shelton, Jessie","Abbamonte, Peter"]},{"key":"dc:creator","label":"Author","values":["Dove, Jason"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2021-03-05T21:33:11Z","2020-07-23","2020-12"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["nuclear","physics","proton","fixed target","parton distribution function","Fermilab","deep-inelastic scattering","E906","SeaQuest"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Jason Dove"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/109313"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\\bar{d}/\\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\\bar{d}/\\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH$_2$) and deuterium (LD$_2$) targets, the SeaQuest experiment probes the $\\bar{d}/\\bar{u}$ ratio up to $x\\approx 0.45$. Data collection has been completed and the status of data analysis for SeaQuest is presented. Two different methods for extracting the LD$_2$/LH$_2$ Drell-Yan cross section ratios for $0.1\\leq x \\leq 0.45$ are presented and the results are in reasonable agreement. These ratios allow for the extraction of $\\bar{d}/\\bar{u}$ revealing an absence of the drop at large $x$ reported earlier by E866. Results from this work are compared with various theoretical models for the flavor structure of the nucleon sea.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms","The student, Jason Dove, accepted the attached license on 2020-07-17 at 15:07.","The student, Jason Dove, submitted this Dissertation for approval on 2020-07-17 at 16:42.","This Dissertation was approved for publication on 2020-07-23 at 17:27.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15684 on 2021-03-04 at 15:32:52","Made available in DSpace on 2021-03-05T21:33:11Z (GMT). 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The Bjorken-$x$ dependence of the $\\bar{d}/\\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\\bar{d}/\\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH$_2$) and deuterium (LD$_2$) targets, the SeaQuest experiment probes the $\\bar{d}/\\bar{u}$ ratio up to $x\\approx 0.45$. Data collection has been completed and the status of data analysis for SeaQuest is presented. Two different methods for extracting the LD$_2$/LH$_2$ Drell-Yan cross section ratios for $0.1\\leq x \\leq 0.45$ are presented and the results are in reasonable agreement. These ratios allow for the extraction of $\\bar{d}/\\bar{u}$ revealing an absence of the drop at large $x$ reported earlier by E866. Results from this work are compared with various theoretical models for the flavor structure of the nucleon sea.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms","The student, Jason Dove, accepted the attached license on 2020-07-17 at 15:07.","The student, Jason Dove, submitted this Dissertation for approval on 2020-07-17 at 16:42.","This Dissertation was approved for publication on 2020-07-23 at 17:27.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15684 on 2021-03-04 at 15:32:52","Made available in DSpace on 2021-03-05T21:33:11Z (GMT). No. of bitstreams: 5 DOVE-DISSERTATION-2020.pdf: 2694718 bytes, checksum: 36f5eefea401a3dfbc8fff3375c220ec (MD5) CertificateOfCompletion.pdf: 121781 bytes, checksum: 3fa19a0cf154032622c0bd82650fc4b1 (MD5) Thesis.zip: 4572641 bytes, checksum: 0efe8eed9602e7120fab3a051ca3baa1 (MD5) LICENSE.txt: 4207 bytes, checksum: f88df9c1368473bebeba0f8b719ea626 (MD5) PROQUEST_LICENSE.txt: 4553 bytes, checksum: 92e67a6da638f693f5f680c2b31012d3 (MD5) Previous issue date: 2020-07-23"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/109313"],"dc:language":["en"],"dc:rights":["Copyright 2020 Jason Dove"],"dc:subject":["nuclear","physics","proton","fixed target","parton distribution function","Fermilab","deep-inelastic scattering","E906","SeaQuest"],"dc:title":["Probing the flavor dependence of proton's light-quark sea in the SeaQuest experiment at Fermilab"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:50Z"}