Four-Fermion production at LEP using the OPAL detector

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.

Author dc:creator

• Boeriu, Oana

Contributors dc:contributor

• Fleck, Ivor

• Four-fermion
• OPAL
• LEP, ZZ

Repository record source_url

https://freidok.uni-freiburg.de/data/649

OAI identifier oai:identifier

oai:freidok.uni-freiburg.de:649