{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25347"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25347","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 pi-minus beryllium interactions","abstract":"This thesis reports on the analysis of data obtained during FNAL experiment EG10. 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 PT. A search was then made for psi mesons of the charmonium spectrum by combining J,Af 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 Jl1Ys produced fran 'Xs. A i(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/psi s resulting from i(3685). Assuming that these are the only particles decaying to J/psi, we obtain the fraction of J/psi produced directly in hadronic collisions-0.58±O.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 EG10. 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 PT. A search was then made for psi mesons of the charmonium spectrum by combining J,Af 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 Jl1Ys produced fran 'Xs. A i(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/psi s resulting from i(3685). Assuming that these are the only particles decaying to J/psi, we obtain the fraction of J/psi produced directly in hadronic collisions-0.58±O.09 -which is relevant to the production mechanism for charmonium in strong interactions.","abstract_has_math":false,"creators":["Hahn, Stephen Robert"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Sard, R.D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-07T18:34:27Z","date_published":"2011-06-07T18:34:27Z","updated_at":"2026-07-22T22:25:24Z","subjects":["charmonium states","pi-minus beryllium interactions","FNAL experiment","dimuon"],"languages":["en"],"rights":["1983 Stephen Robert Hahn"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["744971"],"render_values":[{"text":"744971","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25347","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sard, R.D."]},{"key":"dc:creator","label":"Author","values":["Hahn, Stephen Robert"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-07T18:34:27Z","10000-01-01","1983"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","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."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["charmonium states","pi-minus beryllium interactions","FNAL experiment","dimuon"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1983 Stephen Robert Hahn"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["744971","http://hdl.handle.net/2142/25347"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis reports on the analysis of data obtained during FNAL experiment EG10. 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 PT. A search was then made for psi mesons of the charmonium spectrum by combining J,Af 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 Jl1Ys produced fran 'Xs. A i(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/psi s resulting from i(3685). Assuming that these are the only particles decaying to J/psi, we obtain the fraction of J/psi produced directly in hadronic collisions-0.58±O.09 -which is relevant to the production mechanism for charmonium in strong interactions.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T18:34:27Z No. of bitstreams: 1 1983_hahn.pdf: 6475157 bytes, checksum: f6a23a4015fbb71e0c951d7cd0230599 (MD5)","Made available in DSpace on 2011-06-07T18:34:27Z (GMT). No. of bitstreams: 1 1983_hahn.pdf: 6475157 bytes, checksum: f6a23a4015fbb71e0c951d7cd0230599 (MD5) Previous issue date: 1983","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T18:34:27Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:07-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Production of charmonium states in 225 GeV/c pi-minus beryllium interactions"]}]}],"canonical_facts":{"dc:contributor":["Sard, R.D."],"dc:creator":["Hahn, Stephen Robert"],"dc:date":["2011-06-07T18:34:27Z","10000-01-01","1983"],"dc:description":["This thesis reports on the analysis of data obtained during FNAL experiment EG10. 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 PT. A search was then made for psi mesons of the charmonium spectrum by combining J,Af 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 Jl1Ys produced fran 'Xs. A i(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/psi s resulting from i(3685). Assuming that these are the only particles decaying to J/psi, we obtain the fraction of J/psi produced directly in hadronic collisions-0.58±O.09 -which is relevant to the production mechanism for charmonium in strong interactions.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T18:34:27Z No. of bitstreams: 1 1983_hahn.pdf: 6475157 bytes, checksum: f6a23a4015fbb71e0c951d7cd0230599 (MD5)","Made available in DSpace on 2011-06-07T18:34:27Z (GMT). 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