{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25779"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25779","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Photon decay rate of sigma plus from unsubtracted dispersion relations","abstract":"Taking the viewpoint of unsubtracted dispersion relations we derive integral representations for the weak photon decay amplitudes Fl and F2. The integrals involve the magnetic and electric dipole amplitudes M and .1 Eo+ of the photopion production. They also involve the pion-nucleon scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals were carried out on a computer and the relative decay rate of Sigma+ -> py to its total rate was found to be 0.71 x 10-3, which is comparable with the latest experimental value (1.9 ± 0.4) x 10^-3.","abstract_html":"Taking the viewpoint of unsubtracted dispersion relations we derive integral representations for the weak photon decay amplitudes Fl and F2. The integrals involve the magnetic and electric dipole amplitudes M and .1 Eo+ of the photopion production. They also involve the pion-nucleon scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals were carried out on a computer and the relative decay rate of Sigma+ -> py to its total rate was found to be 0.71 x 10-3, which is comparable with the latest experimental value (1.9 ± 0.4) x 10^-3.","abstract_has_math":false,"creators":["Papaioannou, Gregory Miltiades"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Nishijima, K."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-12T17:59:46Z","date_published":"2011-07-12T17:59:46Z","updated_at":"2026-07-22T22:25:26Z","subjects":["photon decay","unsubtracted dispersion relations","integral representations","weak photon decay amplitudes"],"languages":["en"],"rights":["1969 Gregory Miltiades Papaioannou"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["6068781"],"render_values":[{"text":"6068781","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25779","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Nishijima, K."]},{"key":"dc:creator","label":"Author","values":["Papaioannou, Gregory Miltiades"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-12T17:59:46Z","10000-01-01","1969"]},{"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":["photon decay","unsubtracted dispersion relations","integral representations","weak photon decay amplitudes"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1969 Gregory Miltiades Papaioannou"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["6068781","http://hdl.handle.net/2142/25779"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Taking the viewpoint of unsubtracted dispersion relations we derive integral representations for the weak photon decay amplitudes Fl and F2. The integrals involve the magnetic and electric dipole amplitudes M and .1 Eo+ of the photopion production. They also involve the pion-nucleon scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals were carried out on a computer and the relative decay rate of Sigma+ -> py to its total rate was found to be 0.71 x 10-3, which is comparable with the latest experimental value (1.9 ± 0.4) x 10^-3.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-12T17:59:46Z No. of bitstreams: 1 1969_papiaoannou.pdf: 1956581 bytes, checksum: c885a19a503a8b63529ccc319493d960 (MD5)","Made available in DSpace on 2011-07-12T17:59:46Z (GMT). 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The integrals involve the magnetic and electric dipole amplitudes M and .1 Eo+ of the photopion production. They also involve the pion-nucleon scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals were carried out on a computer and the relative decay rate of Sigma+ -> py to its total rate was found to be 0.71 x 10-3, which is comparable with the latest experimental value (1.9 ± 0.4) x 10^-3.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-12T17:59:46Z No. of bitstreams: 1 1969_papiaoannou.pdf: 1956581 bytes, checksum: c885a19a503a8b63529ccc319493d960 (MD5)","Made available in DSpace on 2011-07-12T17:59:46Z (GMT). No. of bitstreams: 1 1969_papiaoannou.pdf: 1956581 bytes, checksum: c885a19a503a8b63529ccc319493d960 (MD5) Previous issue date: 1969","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-12T17:59:46Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:06-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["6068781","http://hdl.handle.net/2142/25779"],"dc:language":["en"],"dc:rights":["1969 Gregory Miltiades Papaioannou"],"dc:subject":["photon decay","unsubtracted dispersion relations","integral representations","weak photon decay amplitudes"],"dc:title":["Photon decay rate of sigma plus from unsubtracted dispersion relations"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:26Z"}