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 nu(mu)e elas
tic scattering events allow the determination of the electroweak param
eters from the ratio of the cross-sections of neutral-to-charged-curre
nt neutrino electron scattering. The best fit values of the electrowea
k mixing angle sin2 theta(W) and the relative coupling strength rho of
neutral and charged current are: sin2 theta(W) = 0.237 +/- 0.014 and
rho = 0.987 +/- 0.042. In the second topic, coherent single charged pi
on production was measured in neutrino and antineutrino beams. The mea
sured cross-sections, averaged over the wide-band beam spectra and the
glass target nuclei composition, are: sigma(nu(mu)A --> mu-pi+A) = (5
1 +/- 10) X 10(-40) cm2 nucleus and sigma(nu(mu)ABAR --> mu+pi-A) = (4
3 +/- 9) x 10(-40) cm2 nucleus. The energy dependence shows the expect
ed flattering of the cross-sections at high energy.