Article révisé par les pairs
Résumé : An upper limit of 3 × 10-42 Eν cm2 per electron, at 90% confidence level, has been obtained for the cross section of the process νμ + e- → νμ + e-, interpreted in the usual V-A framework, for an electron recoil energy larger than 0.3 GeV. This estimate is based on the observation of one candidate event in exposures of Gargamelle to the CERN PS neutrino beam. © 1978.