{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/77362"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/77362","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Production of Charmonium States in 225 Gev/c Negative Pion Beryllium Interactions","abstract":"This thesis reports on the analysis of data obtained during FNAL experiment E610. The Chicago Cyclotron Magnet Spectrometer was used to perform a study of the hadronic production of charmonium. A 225 GeV/c negative pion beam was incident on a beryllium target. The trigger required a dimuon signature which favored opposite sign muon pairs with a large combined p(,(tau)). A search was then made for (chi) mesons of the charmonium spectrum by combining J/(psi) mesons found in the dimuon spectrum with photons detected in a large lead glass shower detector. These events were used to determine the fraction of J/(psi)s produced from (chi)s. A (psi)(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/(psi)s resulting from (psi)(3685). Assuming that these are the only particles decaying to J/(psi), we obtain the fraction of J/(psi)s produced directly in hadronic collisions--0.58 (+OR-) 0.09--which is relevant to the production mechanism for charmonium in strong interactions.","abstract_html":"This thesis reports on the analysis of data obtained during FNAL experiment E610. The Chicago Cyclotron Magnet Spectrometer was used to perform a study of the hadronic production of charmonium. A 225 GeV/c negative pion beam was incident on a beryllium target. The trigger required a dimuon signature which favored opposite sign muon pairs with a large combined p(,(tau)). A search was then made for (chi) mesons of the charmonium spectrum by combining J/(psi) mesons found in the dimuon spectrum with photons detected in a large lead glass shower detector. These events were used to determine the fraction of J/(psi)s produced from (chi)s. A (psi)(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/(psi)s resulting from (psi)(3685). Assuming that these are the only particles decaying to J/(psi), we obtain the fraction of J/(psi)s produced directly in hadronic collisions--0.58 (+OR-) 0.09--which is relevant to the production mechanism for charmonium in strong interactions.","abstract_has_math":false,"creators":["Hahn, Stephen Robert"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-13T15:41:41Z","date_published":"2015-05-13T15:41:41Z","updated_at":"2026-07-22T22:26:10Z","subjects":["Physics, Elementary Particles and High Energy"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8409941"],"render_values":[{"text":"(UMI)AAI8409941","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/77362","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Hahn, Stephen Robert"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-05-13T15:41:41Z","10000-01-01","1983"]},{"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":["Physics, Elementary Particles and High Energy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/77362","(UMI)AAI8409941"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis reports on the analysis of data obtained during FNAL experiment E610. The Chicago Cyclotron Magnet Spectrometer was used to perform a study of the hadronic production of charmonium. A 225 GeV/c negative pion beam was incident on a beryllium target. The trigger required a dimuon signature which favored opposite sign muon pairs with a large combined p(,(tau)). A search was then made for (chi) mesons of the charmonium spectrum by combining J/(psi) mesons found in the dimuon spectrum with photons detected in a large lead glass shower detector. These events were used to determine the fraction of J/(psi)s produced from (chi)s. A (psi)(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/(psi)s resulting from (psi)(3685). Assuming that these are the only particles decaying to J/(psi), we obtain the fraction of J/(psi)s produced directly in hadronic collisions--0.58 (+OR-) 0.09--which is relevant to the production mechanism for charmonium in strong interactions.","Made available in DSpace on 2015-05-13T15:41:41Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8409941.PDF: 5757144 bytes, checksum: dc2baaaf5f0fcbfb3cd41403d9a4e375 (MD5) Previous issue date: 1983","Embargo set by: Seth Robbins for item 78573 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","240 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983."]},{"key":"dc:title","label":"Title","values":["Production of Charmonium States in 225 Gev/c Negative Pion Beryllium Interactions"]}]}],"canonical_facts":{"dc:creator":["Hahn, Stephen Robert"],"dc:date":["2015-05-13T15:41:41Z","10000-01-01","1983"],"dc:description":["This thesis reports on the analysis of data obtained during FNAL experiment E610. The Chicago Cyclotron Magnet Spectrometer was used to perform a study of the hadronic production of charmonium. A 225 GeV/c negative pion beam was incident on a beryllium target. The trigger required a dimuon signature which favored opposite sign muon pairs with a large combined p(,(tau)). A search was then made for (chi) mesons of the charmonium spectrum by combining J/(psi) mesons found in the dimuon spectrum with photons detected in a large lead glass shower detector. These events were used to determine the fraction of J/(psi)s produced from (chi)s. A (psi)(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/(psi)s resulting from (psi)(3685). Assuming that these are the only particles decaying to J/(psi), we obtain the fraction of J/(psi)s produced directly in hadronic collisions--0.58 (+OR-) 0.09--which is relevant to the production mechanism for charmonium in strong interactions.","Made available in DSpace on 2015-05-13T15:41:41Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8409941.PDF: 5757144 bytes, checksum: dc2baaaf5f0fcbfb3cd41403d9a4e375 (MD5) Previous issue date: 1983","Embargo set by: Seth Robbins for item 78573 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","240 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983."],"dc:identifier":["http://hdl.handle.net/2142/77362","(UMI)AAI8409941"],"dc:language":["eng"],"dc:subject":["Physics, Elementary Particles and High Energy"],"dc:title":["Production of Charmonium States in 225 Gev/c Negative Pion Beryllium Interactions"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:10Z"}