{"id":{"repo_id":"wm-mary","oai_identifier":"oai:scholarworks.wm.edu:internal/5617"},"canonical_url":"https://search.dev.ndltd.org/etd/wm-mary/oai:scholarworks.wm.edu:internal/5617","repository":{"repo_id":"wm-mary","name":"College of William and Mary","base_url":"https://scholarworks.wm.edu/server/oai/request"},"display":{"title":"Measurement of the branching fraction for the decay neutral kaon(long) going to pion-antipion-positron-electron in the high M(pi-pi) invariant mass region","abstract":"A measurement of the branching fraction for the rare decay K0L → pi+pi-e +e- was performed using data collected from experiment E871 which ran at the AGS of Brookhaven National Laboratory. Analysis of the data revealed 27.7 +/- 7.4 signal events in the signal region, 0.4905 GeV < Mpipiee < 0.505 GeV together with 13.3 +/- 3.7 background events. The branching fractions of ( 8.5+/-2.3stat +/-1.0sys ) x 10-6 using the phenomenological model acceptance and ( 2.3+/-0.6stat +/-0.3sys ) x 10-6 using the chiral perturbation model represent the first measurements for K0L → pi+pi-e +e- in the dipion invariant mass region 0.475 GeV < Mpipi < 0.497 GeV. These results support the prediction of chiral perturbation theory rather than that of the phenomenological model.","abstract_html":"A measurement of the branching fraction for the rare decay K0L → pi+pi-e +e- was performed using data collected from experiment E871 which ran at the AGS of Brookhaven National Laboratory. Analysis of the data revealed 27.7 +/- 7.4 signal events in the signal region, 0.4905 GeV &lt; Mpipiee &lt; 0.505 GeV together with 13.3 +/- 3.7 background events. The branching fractions of ( 8.5+/-2.3stat +/-1.0sys ) x 10-6 using the phenomenological model acceptance and ( 2.3+/-0.6stat +/-0.3sys ) x 10-6 using the chiral perturbation model represent the first measurements for K0L → pi+pi-e +e- in the dipion invariant mass region 0.475 GeV &lt; Mpipi &lt; 0.497 GeV. These results support the prediction of chiral perturbation theory rather than that of the phenomenological model.","abstract_has_math":false,"creators":["Moss, Joshua J."],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"College of William & Mary - Arts & Sciences","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2007,"date_issued":"2007-01-01","date_published":"2007-01-01","updated_at":"2026-08-21T16:50:58Z","subjects":[],"languages":[],"rights":["© The Author"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://dx.doi.org/doi:10.21220/s2-843x-vn61"],"render_values":[{"text":"https://dx.doi.org/doi:10.21220/s2-843x-vn61","href":"https://dx.doi.org/doi:10.21220/s2-843x-vn61","code":true}]}]},"links":{"outbound_url":"https://scholarworks.wm.edu/handle/internal/5617","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"source_record":{"url":"https://scholarworks.wm.edu/server/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Ascholarworks.wm.edu%3Ainternal%2F5617","prefix":"dim"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["College of William & Mary - Arts & Sciences"]},{"key":"dc:creator","label":"Author","values":["Moss, Joshua J."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-06-11T10:45:35.267"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-06-12T10:43:43Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2018-10-16T00:00:00Z"]},{"key":"dc:date.issued","label":"Date","values":["2007-01-01"]},{"key":"dc:type","label":"Dc Type","values":["dissertation","article"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["© The Author"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://dx.doi.org/doi:10.21220/s2-843x-vn61"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://scholarworks.wm.edu/handle/internal/5617"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A measurement of the branching fraction for the rare decay K0L → pi+pi-e +e- was performed using data collected from experiment E871 which ran at the AGS of Brookhaven National Laboratory. Analysis of the data revealed 27.7 +/- 7.4 signal events in the signal region, 0.4905 GeV < Mpipiee < 0.505 GeV together with 13.3 +/- 3.7 background events. The branching fractions of ( 8.5+/-2.3stat +/-1.0sys ) x 10-6 using the phenomenological model acceptance and ( 2.3+/-0.6stat +/-0.3sys ) x 10-6 using the chiral perturbation model represent the first measurements for K0L → pi+pi-e +e- in the dipion invariant mass region 0.475 GeV < Mpipi < 0.497 GeV. These results support the prediction of chiral perturbation theory rather than that of the phenomenological model."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Doctor of Philosophy (Ph.D.)"]},{"key":"dc:title","label":"Title","values":["Measurement of the branching fraction for the decay neutral kaon(long) going to pion-antipion-positron-electron in the high M(pi-pi) invariant mass region"]}]}],"canonical_facts":{"dc:contributor.department":["College of William & Mary - Arts & Sciences"],"dc:creator":["Moss, Joshua J."],"dc:date":["2025-06-11T10:45:35.267"],"dc:date.accessioned":["2025-06-12T10:43:43Z"],"dc:date.available":["2018-10-16T00:00:00Z"],"dc:date.issued":["2007-01-01"],"dc:description.abstract":["A measurement of the branching fraction for the rare decay K0L → pi+pi-e +e- was performed using data collected from experiment E871 which ran at the AGS of Brookhaven National Laboratory. Analysis of the data revealed 27.7 +/- 7.4 signal events in the signal region, 0.4905 GeV < Mpipiee < 0.505 GeV together with 13.3 +/- 3.7 background events. The branching fractions of ( 8.5+/-2.3stat +/-1.0sys ) x 10-6 using the phenomenological model acceptance and ( 2.3+/-0.6stat +/-0.3sys ) x 10-6 using the chiral perturbation model represent the first measurements for K0L → pi+pi-e +e- in the dipion invariant mass region 0.475 GeV < Mpipi < 0.497 GeV. These results support the prediction of chiral perturbation theory rather than that of the phenomenological model."],"dc:description.degree":["Doctor of Philosophy (Ph.D.)"],"dc:identifier.doi":["https://dx.doi.org/doi:10.21220/s2-843x-vn61"],"dc:identifier.uri":["https://scholarworks.wm.edu/handle/internal/5617"],"dc:rights":["© The Author"],"dc:title":["Measurement of the branching fraction for the decay neutral kaon(long) going to pion-antipion-positron-electron in the high M(pi-pi) invariant mass region"],"dc:type":["dissertation","article"]},"updated_at":"2026-08-21T16:50:58Z"}