{"id":{"repo_id":"columbia-diss","oai_identifier":"oai:academiccommons.columbia.edu:10.7916/D8V41262"},"canonical_url":"https://search.dev.ndltd.org/etd/columbia-diss/oai:academiccommons.columbia.edu:10.7916/D8V41262","repository":{"repo_id":"columbia-diss","name":"Columbia University","base_url":"https://academiccommons.columbia.edu/oai"},"display":{"title":"Electron-Muon Correlations in Proton+Proton and Deuteron+Gold Collisions at PHENIX","abstract":"This dissertation presents the first measurement of electron-muon azimuthal correlations at the PHENIX experiment at RHIC in 200 GeV proton-proton and deuteron-gold collisions. Electron-muon pairs result from the semileptonic decay of D mesons, which come from correlated charm pairs. The pairs are measured at forward rapidity, with ∣η∣ < 0.5 for the electron and 1.4 < ∣η∣ < 2.1 for the muon. Electron-muon pairs exhibit a characteristic peak at Δφ = π in the azimuthal distribution due to momentum conservation in the 𝑐𝑐¯ decay, and this enables clear identification. The shape of the azimuthal pair distribution in 𝑝+𝑝 collisions helps us determine which hard scattering processes contribute to charm production, and it allows us to test NLO QCD predictions. The 𝑝+𝑝result also serves as a baseline measurement for understanding heavy ion collisions. Pairs were also measured in 𝑑+Au collisions at forward rapidity in the deuteron-going direction, which is a kinematic region at which we expect suppression effects to be evident. The pair yield in 𝑑+Au was found to be suppressed relative to that in 𝑝+𝑝. Also the peak in Δφ almost disappears in 𝑑+Au, indicating either a change in charm production mechanisms or interactions with the nuclear matter.","abstract_html":"This dissertation presents the first measurement of electron-muon azimuthal correlations at the PHENIX experiment at RHIC in 200 GeV proton-proton and deuteron-gold collisions. Electron-muon pairs result from the semileptonic decay of D mesons, which come from correlated charm pairs. The pairs are measured at forward rapidity, with ∣η∣ &lt; 0.5 for the electron and 1.4 &lt; ∣η∣ &lt; 2.1 for the muon. Electron-muon pairs exhibit a characteristic peak at Δφ = π in the azimuthal distribution due to momentum conservation in the 𝑐𝑐¯ decay, and this enables clear identification. The shape of the azimuthal pair distribution in 𝑝+𝑝 collisions helps us determine which hard scattering processes contribute to charm production, and it allows us to test NLO QCD predictions. The 𝑝+𝑝result also serves as a baseline measurement for understanding heavy ion collisions. Pairs were also measured in 𝑑+Au collisions at forward rapidity in the deuteron-going direction, which is a kinematic region at which we expect suppression effects to be evident. The pair yield in 𝑑+Au was found to be suppressed relative to that in 𝑝+𝑝. Also the peak in Δφ almost disappears in 𝑑+Au, indicating either a change in charm production mechanisms or interactions with the nuclear matter.","abstract_has_math":false,"creators":["Engelmore, Tatia"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011","date_published":"2011","updated_at":"2026-07-24T01:44:13Z","subjects":["Nuclear physics","Proton-proton interactions","Deuteron reactions","Gold","Collisions (Nuclear physics)"],"languages":["English"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://doi.org/10.7916/D8V41262","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Engelmore, Tatia"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011"]},{"key":"dc:type","label":"Dc Type","values":["Theses"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Nuclear physics","Proton-proton interactions","Deuteron reactions","Gold","Collisions (Nuclear physics)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://doi.org/10.7916/D8V41262"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This dissertation presents the first measurement of electron-muon azimuthal correlations at the PHENIX experiment at RHIC in 200 GeV proton-proton and deuteron-gold collisions. Electron-muon pairs result from the semileptonic decay of D mesons, which come from correlated charm pairs. The pairs are measured at forward rapidity, with ∣η∣ < 0.5 for the electron and 1.4 < ∣η∣ < 2.1 for the muon. Electron-muon pairs exhibit a characteristic peak at Δφ = π in the azimuthal distribution due to momentum conservation in the 𝑐𝑐¯ decay, and this enables clear identification. The shape of the azimuthal pair distribution in 𝑝+𝑝 collisions helps us determine which hard scattering processes contribute to charm production, and it allows us to test NLO QCD predictions. The 𝑝+𝑝result also serves as a baseline measurement for understanding heavy ion collisions. Pairs were also measured in 𝑑+Au collisions at forward rapidity in the deuteron-going direction, which is a kinematic region at which we expect suppression effects to be evident. The pair yield in 𝑑+Au was found to be suppressed relative to that in 𝑝+𝑝. Also the peak in Δφ almost disappears in 𝑑+Au, indicating either a change in charm production mechanisms or interactions with the nuclear matter."]},{"key":"dc:title","label":"Title","values":["Electron-Muon Correlations in Proton+Proton and Deuteron+Gold Collisions at PHENIX"]}]}],"canonical_facts":{"dc:creator":["Engelmore, Tatia"],"dc:date":["2011"],"dc:description":["This dissertation presents the first measurement of electron-muon azimuthal correlations at the PHENIX experiment at RHIC in 200 GeV proton-proton and deuteron-gold collisions. Electron-muon pairs result from the semileptonic decay of D mesons, which come from correlated charm pairs. The pairs are measured at forward rapidity, with ∣η∣ < 0.5 for the electron and 1.4 < ∣η∣ < 2.1 for the muon. Electron-muon pairs exhibit a characteristic peak at Δφ = π in the azimuthal distribution due to momentum conservation in the 𝑐𝑐¯ decay, and this enables clear identification. The shape of the azimuthal pair distribution in 𝑝+𝑝 collisions helps us determine which hard scattering processes contribute to charm production, and it allows us to test NLO QCD predictions. The 𝑝+𝑝result also serves as a baseline measurement for understanding heavy ion collisions. Pairs were also measured in 𝑑+Au collisions at forward rapidity in the deuteron-going direction, which is a kinematic region at which we expect suppression effects to be evident. The pair yield in 𝑑+Au was found to be suppressed relative to that in 𝑝+𝑝. Also the peak in Δφ almost disappears in 𝑑+Au, indicating either a change in charm production mechanisms or interactions with the nuclear matter."],"dc:identifier":["https://doi.org/10.7916/D8V41262"],"dc:language":["English"],"dc:subject":["Nuclear physics","Proton-proton interactions","Deuteron reactions","Gold","Collisions (Nuclear physics)"],"dc:title":["Electron-Muon Correlations in Proton+Proton and Deuteron+Gold Collisions at PHENIX"],"dc:type":["Theses"]},"updated_at":"2026-07-24T01:44:13Z"}