Study of Z boson pair production in e+e- collisions at LEP at √s = 189 GeV

• Autores: Dova, María Teresa; L3 Collaboration
• Año de publicación: 1999
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; Física; e+e- collision; Z boson; L3 detector; centre-of-mass energies
• Institución: Universidad Nacional de La Plata

The pair production of Z bosons is studied using the data collected by the L3 detector at LEP in 1998 in e+e- collisions at a centre-of-mass energy of 189 GeV. All the visible final states are considered and the cross section of this process is q0.15 measured to be $\text{0.74}{}^{\mathrm{+0.15}}{}_{\mathrm{-0.14}}\text{(}\text{stat.)}\text{±0.04}\text{(}\text{syst.)}\text{pb}$. Final states containing b quarks are enhanced by a dedicated selection and their production cross section is found to be $\text{0.18}{}^{\mathrm{+0.09}}{}_{\mathrm{-0.07}}\text{(}\text{stat.)}\text{±0.02}\text{(syst.)}\text{pb}$. Both results are in agreement with the Standard Model predictions. Limits on anomalous couplings between neutral gauge bosons are derived from these measurements.
Facultad de Ciencias Exactas