Measurement of W-pair cross sections in e+e− interactions at √s = 172 GeV and W-decay branching fractions
We report on the measurement of W-boson pair-production with the L3 detector at LEP at an average centre-of-mass energy of 172.13 GeV. In a data sample corresponding to a total luminosity of 10.25 pb<sup>−1</sup> we select 110 four-fermion events with pairs of hadronic jets or leptons wi...
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| Autores principales: | , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1997
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/80450 |
| Aporte de: |
| Sumario: | We report on the measurement of W-boson pair-production with the L3 detector at LEP at an average centre-of-mass energy of 172.13 GeV. In a data sample corresponding to a total luminosity of 10.25 pb<sup>−1</sup> we select 110 four-fermion events with pairs of hadronic jets or leptons with high invariant masses. Branching fractions of W decays into different fermion-antifermion pairs are determined with and without the assumption of charged-current lepton universality. The branching fraction for hadronic W decays is measured to be: B(W → hadrons) = 64.2<sup>+3.7</sup><sub>−3.8</sub> (stat.) ± 0.5 (syst.) %. Combining all final states the total cross section for W-pair production is measured to be: σ<sub>WW</sub> = 12.27<sup>+1.41</sup><sub>−1.32</sub> (stat.) ± 0.23 (syst.) pb. The results are in good agreement with the Standard Model. |
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