{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25319"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25319","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Comparison of pion- and proton- production of charmonium","abstract":"\"Charmonium X states produced in pi--beryllium interactions at 190 Gev/c and in proton-beryllium interactions at 200 Gev/c and 250 Gev/c have been observed via their decay into J/'+y. This experiment was carried out with the Chicago Cyclotron Magnet Spectrometer at Fermilab. The fraction of J/\"\"s resulting from X decay is measured to be 0.33±O.07 for incident pions and 0.47±0.2l for incident protons. The X(35l0) and X(3555) are produced in roughly equal numbers for pions, but the X(3555) dominates for protons. Simple gluon fusion accounts for X production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain X production by pions.\"","abstract_html":""Charmonium X states produced in pi--beryllium interactions at 190 Gev/c and in proton-beryllium interactions at 200 Gev/c and 250 Gev/c have been observed via their decay into J/'+y. This experiment was carried out with the Chicago Cyclotron Magnet Spectrometer at Fermilab. The fraction of J/""s resulting from X decay is measured to be 0.33±O.07 for incident pions and 0.47±0.2l for incident protons. The X(35l0) and X(3555) are produced in roughly equal numbers for pions, but the X(3555) dominates for protons. Simple gluon fusion accounts for X production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain X production by pions."","abstract_has_math":false,"creators":["Graff, Thomas Leo"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Koester, L.J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-07T15:28:19Z","date_published":"2011-06-07T15:28:19Z","updated_at":"2026-07-22T22:25:24Z","subjects":["pion production","proton production","charmonium","charmonium X states","proton-beryllium interactions"],"languages":["en"],"rights":["1984 Thomas Leo Graff"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["4786502"],"render_values":[{"text":"4786502","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25319","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Koester, L.J."]},{"key":"dc:creator","label":"Author","values":["Graff, Thomas Leo"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-07T15:28:19Z","10000-01-01","1984"]},{"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":["pion production","proton production","charmonium","charmonium X states","proton-beryllium interactions"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1984 Thomas Leo Graff"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["4786502","http://hdl.handle.net/2142/25319"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"Charmonium X states produced in pi--beryllium interactions at 190 Gev/c and in proton-beryllium interactions at 200 Gev/c and 250 Gev/c have been observed via their decay into J/'+y. This experiment was carried out with the Chicago Cyclotron Magnet Spectrometer at Fermilab. The fraction of J/\"\"s resulting from X decay is measured to be 0.33±O.07 for incident pions and 0.47±0.2l for incident protons. The X(35l0) and X(3555) are produced in roughly equal numbers for pions, but the X(3555) dominates for protons. Simple gluon fusion accounts for X production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain X production by pions.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:28:19Z No. of bitstreams: 1 1984_graff.pdf: 3741744 bytes, checksum: a40b980fe8564982a3093b9d877f3249 (MD5)","Made available in DSpace on 2011-06-07T15:28:19Z (GMT). No. of bitstreams: 1 1984_graff.pdf: 3741744 bytes, checksum: a40b980fe8564982a3093b9d877f3249 (MD5) Previous issue date: 1984","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:28:19Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:18-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Comparison of pion- and proton- production of charmonium"]}]}],"canonical_facts":{"dc:contributor":["Koester, L.J."],"dc:creator":["Graff, Thomas Leo"],"dc:date":["2011-06-07T15:28:19Z","10000-01-01","1984"],"dc:description":["\"Charmonium X states produced in pi--beryllium interactions at 190 Gev/c and in proton-beryllium interactions at 200 Gev/c and 250 Gev/c have been observed via their decay into J/'+y. This experiment was carried out with the Chicago Cyclotron Magnet Spectrometer at Fermilab. The fraction of J/\"\"s resulting from X decay is measured to be 0.33±O.07 for incident pions and 0.47±0.2l for incident protons. The X(35l0) and X(3555) are produced in roughly equal numbers for pions, but the X(3555) dominates for protons. Simple gluon fusion accounts for X production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain X production by pions.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:28:19Z No. of bitstreams: 1 1984_graff.pdf: 3741744 bytes, checksum: a40b980fe8564982a3093b9d877f3249 (MD5)","Made available in DSpace on 2011-06-07T15:28:19Z (GMT). No. of bitstreams: 1 1984_graff.pdf: 3741744 bytes, checksum: a40b980fe8564982a3093b9d877f3249 (MD5) Previous issue date: 1984","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:28:19Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:18-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["4786502","http://hdl.handle.net/2142/25319"],"dc:language":["en"],"dc:rights":["1984 Thomas Leo Graff"],"dc:subject":["pion production","proton production","charmonium","charmonium X states","proton-beryllium interactions"],"dc:title":["Comparison of pion- and proton- production of charmonium"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}