{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:36"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:36","repository":{"repo_id":"freiburg-diss","name":"University of Freiburg","base_url":"https://freidok.uni-freiburg.de/oai/oai2.php"},"display":{"title":"Untersuchung von ZZ Endzustaenden mit dem OPAL-Detektor","abstract":"The production of ZZ -> qqll events has been studied with the OPAL <br>detector at LEP. The analysis is based on 440 pb^-1 of data <br>recorded at six different centre-of-mass energies between 183 GeV and <br>202 GeV in the years 1997 to 1999. For each possible final state <br>(l = e, mu, tau) a selection has been developed. Final <br>states with and without bbbar have also been separated. The <br>results are used to determine the ZZ production cross section. Using <br>a more general analysis, four fermion events have been selected without <br>making any special requirements concerning the invariant masses of <br>the fermion pairs. Comparisions with Standard Model predictions have been <br>performed. The ZZ production cross section is also determined after <br>combining the results of the ZZ -> qqll and ZZ -> bbll <br>selections with the results of other ZZ final states. The <br>measurements, along with the angular distribution of the observed <br>events, are used to extract limits on anomalous neutral current triple <br>gauge couplings.","abstract_html":"The production of ZZ -&gt; qqll events has been studied with the OPAL &lt;br&gt;detector at LEP. The analysis is based on 440 pb^-1 of data &lt;br&gt;recorded at six different centre-of-mass energies between 183 GeV and &lt;br&gt;202 GeV in the years 1997 to 1999. For each possible final state &lt;br&gt;(l = e, mu, tau) a selection has been developed. Final &lt;br&gt;states with and without bbbar have also been separated. The &lt;br&gt;results are used to determine the ZZ production cross section. Using &lt;br&gt;a more general analysis, four fermion events have been selected without &lt;br&gt;making any special requirements concerning the invariant masses of &lt;br&gt;the fermion pairs. Comparisions with Standard Model predictions have been &lt;br&gt;performed. The ZZ production cross section is also determined after &lt;br&gt;combining the results of the ZZ -&gt; qqll and ZZ -&gt; bbll &lt;br&gt;selections with the results of other ZZ final states. The &lt;br&gt;measurements, along with the angular distribution of the observed &lt;br&gt;events, are used to extract limits on anomalous neutral current triple &lt;br&gt;gauge couplings.","abstract_has_math":false,"creators":["Kolrep, Martin"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Herten, Gregor"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T02:21:24Z","subjects":["ZZ Ereignisse","ZZ Endzustaende","ZZ Wirkungsquerschnitt","ZZ cross section","ZZ final states"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/36","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Herten, Gregor"]},{"key":"dc:creator","label":"Author","values":["Kolrep, Martin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["DoctoralThesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["ZZ Ereignisse","ZZ Endzustaende","ZZ Wirkungsquerschnitt","ZZ cross section","ZZ final states"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The production of ZZ -> qqll events has been studied with the OPAL <br>detector at LEP. The analysis is based on 440 pb^-1 of data <br>recorded at six different centre-of-mass energies between 183 GeV and <br>202 GeV in the years 1997 to 1999. For each possible final state <br>(l = e, mu, tau) a selection has been developed. Final <br>states with and without bbbar have also been separated. The <br>results are used to determine the ZZ production cross section. Using <br>a more general analysis, four fermion events have been selected without <br>making any special requirements concerning the invariant masses of <br>the fermion pairs. Comparisions with Standard Model predictions have been <br>performed. The ZZ production cross section is also determined after <br>combining the results of the ZZ -> qqll and ZZ -> bbll <br>selections with the results of other ZZ final states. The <br>measurements, along with the angular distribution of the observed <br>events, are used to extract limits on anomalous neutral current triple <br>gauge couplings."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Untersuchung von ZZ Endzustaenden mit dem OPAL-Detektor"]}]}],"canonical_facts":{"dc:contributor":["Herten, Gregor"],"dc:creator":["Kolrep, Martin"],"dc:description.abstract":["The production of ZZ -> qqll events has been studied with the OPAL <br>detector at LEP. The analysis is based on 440 pb^-1 of data <br>recorded at six different centre-of-mass energies between 183 GeV and <br>202 GeV in the years 1997 to 1999. For each possible final state <br>(l = e, mu, tau) a selection has been developed. Final <br>states with and without bbbar have also been separated. The <br>results are used to determine the ZZ production cross section. Using <br>a more general analysis, four fermion events have been selected without <br>making any special requirements concerning the invariant masses of <br>the fermion pairs. Comparisions with Standard Model predictions have been <br>performed. The ZZ production cross section is also determined after <br>combining the results of the ZZ -> qqll and ZZ -> bbll <br>selections with the results of other ZZ final states. The <br>measurements, along with the angular distribution of the observed <br>events, are used to extract limits on anomalous neutral current triple <br>gauge couplings."],"dc:format.medium":["application/pdf"],"dc:subject":["ZZ Ereignisse","ZZ Endzustaende","ZZ Wirkungsquerschnitt","ZZ cross section","ZZ final states"],"dc:title":["Untersuchung von ZZ Endzustaenden mit dem OPAL-Detektor"],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:21:24Z"}