Measurement of the e+e−→Zγγ cross section and determination of quartic gauge boson couplings at LEP

• Autores: Dova, María Teresa; L3 Collaboration
• Año de publicación: 2000
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; quartic gauge boson; LEP; L3 detector; Física
• Institución: Universidad Nacional de La Plata

A first measurement of the cross section of the process e+e−→Zγγ is reported using a total integrated luminosity of 231 pby1 collected with the L3 detector at centre-of-mass energies of 182.7 GeV and 188.7 GeV. By selecting hadronic events with two isolated photons the eqeyTMZgg cross section is measured to be $\text{0.49}{}^{\mathrm{+0.20}}{}_{\mathrm{-0.17}}\text{±0.04}\text{pb}$ at 182.7 GeV and $\text{0.47±0.10±0.04}\text{pb}$ at 188.7 GeV. The measurements are consistent with Standard Model expectations. Limits on Quartic Gauge Boson Couplings aa0/Λ2 and ac/Λ2 of $\text{−0.009}\text{GeV}{}^{\mathrm{-2}}\text{<a}{}_0\text{/Λ}{}^2\text{<0.008}\text{GeV}{}^{\mathrm{-2}}$ and $\text{−0.007}\text{GeV}{}^{\mathrm{-2}}\text{<a}{}_{\mathrm{c}}\text{/Λ}{}^2\text{<0.013}\text{GeV}{}^{\mathrm{-2}}$ are derived at 95% confidence level.
Facultad de Ciencias Exactas