par Vilain, Pierre 
;Wilquet, Gaston ;Akkus, B; [et al.]
Référence Nuclear physics. B, Proceedings supplement, 31, C, page (293-300)
Publication Publié, 1993
;Wilquet, Gaston ;Akkus, B; [et al.]Référence Nuclear physics. B, Proceedings supplement, 31, C, page (293-300)
Publication Publié, 1993
Article révisé par les pairs
| Résumé : | New results on inverse muon decay and coherent charged pion production by neutrinos are presented. The data come from the CHARM-II neutrino detector operated at the CERN wide-band neutrino beam. High-statistics data samples of 14500 inverse muon decay events and 3500 νμe elastic scattering events allow the determination of the electroweak parameters from the ratio of the cross-sections of neutral-to-charged-current neutrino electron scattering. The best fit values of the electroweak mixing angle sin2Ωw and the relative coupling strength ρ{variant} of neutral and charged current are: sin2Ωw = 0.237 ± 0.014 and ρ{variant} = 0.987 ± 0.042. In the second topic, coherent single charged pion production was measured in neutrino and antineutrino beams. The measured cross-sections, averaged over the wide-band beam spectra and the glass target nuclei composition, are: σ(νμA → μ-π+A) = (51 ± 10) × 10-40 cm2 nucleus and σ(νμA → μ+π-A) = (43 ± 9) × 10-40 cm2 nucleus. The energy dependence shows the expected flattering of the cross-sections at high energy. © 1993. |
