(eng)
We are reporting on a determination of neutral current coupling constants from a study of differential cross sections of muon-(anti)neutrino electron scattering. The results were obtained with the CHARM-II detector which was exposed to the CERN wide band neutrino beam in the years 1987 to 1991. A total of about scattering events were observed. We present a preliminary value of sin2φw determined with the ratio of neutrino and antineutrino electron scattering cross-sections, based on the full data sample, and we give a determination of the effective vector and axial-vector neutral current coupling constants and the first measurement of the shape of the y-distributions based on 80% of the total statistics.
Grégoire, G. ; Lemaitre, V. ; Knoops, E. ; Akkus, B. ; Favart, Denis ; et. al. Neutral current coupling constants from neutrino electron scattering. In: Nuclear Physics, Section B, Proceedings Supplements, Vol. 31, p. 287-292 (1993)