{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:649"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:649","repository":{"repo_id":"freiburg-diss","name":"University of Freiburg","base_url":"https://freidok.uni-freiburg.de/oai/oai2.php"},"display":{"title":"Four-Fermion production at LEP using the OPAL detector","abstract":"In 1997 LEP reached energies at which the production of heavy
gauge pairs of bosons was possible. Over 650 pb$^{-1}$ of
data have been analysed at centre-of-mass energies between 183 and 209 GeV.
Four-fermion final states stemming from decays of the Z$gamma^*$ into
$
m q ar{q}l^+l^-$, where l stands for electrons or muons, has been investigated. Cross-sections have been calculated for all centre-of-mass energies and compared to those expected from Monte Carlo predictions.
ZZ decays into $
m q ar{q}l^+l^-$, where l stands for
electrons, muons or taus, were investigated as well. In this analysis, mass windows have been applied around the Z mass.
Cross-sections were calculated for all centre-of-mass energies, taking into
account this analysis as well as all other detectable final states, i.e. the
entirely leptonic, hadronic and $
m qoverline{q}
unu$ channels.
Limits on anomalous couplings have been calculated using the ZZ final state
decay products, from changes in the total cross-section for
$
m e^+e^-
ightarrow$ ZZ and changes in the distribution of the
Z production angles.","abstract_html":"In 1997 LEP reached energies at which the production of heavy <br>gauge pairs of bosons was possible. Over 650 pb-1 of <br>data have been analysed at centre-of-mass energies between 183 and 209 GeV. <br>Four-fermion final states stemming from decays of the Zgamma* into <br> <br>m q ar{q}l+l-, where l stands for electrons or muons, has been investigated. Cross-sections have been calculated for all centre-of-mass energies and compared to those expected from Monte Carlo predictions. <br>ZZ decays into <br>m q ar{q}l+l-, where l stands for <br>electrons, muons or taus, were investigated as well. In this analysis, mass windows have been applied around the Z mass. <br>Cross-sections were calculated for all centre-of-mass energies, taking into <br>account this analysis as well as all other detectable final states, i.e. the <br>entirely leptonic, hadronic and $ <br>m qoverline{q} <br>unu$ channels. <br>Limits on anomalous couplings have been calculated using the ZZ final state <br>decay products, from changes in the total cross-section for <br> <br>m e+e- <br>ightarrow ZZ and changes in the distribution of the <br>Z production angles.","abstract_has_math":true,"creators":["Boeriu, Oana"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Fleck, Ivor"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T02:21:52Z","subjects":["Four-fermion","OPAL","LEP, ZZ"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/649","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Fleck, Ivor"]},{"key":"dc:creator","label":"Author","values":["Boeriu, Oana"]}]},{"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":["Four-fermion","OPAL","LEP, ZZ"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["In 1997 LEP reached energies at which the production of heavy
gauge pairs of bosons was possible. Over 650 pb$^{-1}$ of
data have been analysed at centre-of-mass energies between 183 and 209 GeV.
Four-fermion final states stemming from decays of the Z$gamma^*$ into
$
m q ar{q}l^+l^-$, where l stands for electrons or muons, has been investigated. Cross-sections have been calculated for all centre-of-mass energies and compared to those expected from Monte Carlo predictions.
ZZ decays into $
m q ar{q}l^+l^-$, where l stands for
electrons, muons or taus, were investigated as well. In this analysis, mass windows have been applied around the Z mass.
Cross-sections were calculated for all centre-of-mass energies, taking into
account this analysis as well as all other detectable final states, i.e. the
entirely leptonic, hadronic and $
m qoverline{q}
unu$ channels.
Limits on anomalous couplings have been calculated using the ZZ final state
decay products, from changes in the total cross-section for
$
m e^+e^-
ightarrow$ ZZ and changes in the distribution of the
Z production angles."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Four-Fermion production at LEP using the OPAL detector","Vier-Fermion Produktion bei LEP mit dem OPAL Detektor"]}]}],"canonical_facts":{"dc:contributor":["Fleck, Ivor"],"dc:creator":["Boeriu, Oana"],"dc:description.abstract":["In 1997 LEP reached energies at which the production of heavy
gauge pairs of bosons was possible. Over 650 pb$^{-1}$ of
data have been analysed at centre-of-mass energies between 183 and 209 GeV.
Four-fermion final states stemming from decays of the Z$gamma^*$ into
$
m q ar{q}l^+l^-$, where l stands for electrons or muons, has been investigated. Cross-sections have been calculated for all centre-of-mass energies and compared to those expected from Monte Carlo predictions.
ZZ decays into $
m q ar{q}l^+l^-$, where l stands for
electrons, muons or taus, were investigated as well. In this analysis, mass windows have been applied around the Z mass.
Cross-sections were calculated for all centre-of-mass energies, taking into
account this analysis as well as all other detectable final states, i.e. the
entirely leptonic, hadronic and $
m qoverline{q}
unu$ channels.
Limits on anomalous couplings have been calculated using the ZZ final state
decay products, from changes in the total cross-section for
$
m e^+e^-
ightarrow$ ZZ and changes in the distribution of the
Z production angles."],"dc:format.medium":["application/pdf"],"dc:subject":["Four-fermion","OPAL","LEP, ZZ"],"dc:title":["Four-Fermion production at LEP using the OPAL detector","Vier-Fermion Produktion bei LEP mit dem OPAL Detektor"],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:21:52Z"}