Measurement of electron-neutrino electron elastic scattering

The cross section for the elastic scattering reaction νe + e − → νe + e was measured by the Liquid Scintillator Neutrino Detector using a μ decay-at-rest νe beam at the Los Alamos Neutron Science Center. The standard model of electroweak physics predicts a large destructive interference between the charge current and neutral current channels for this reaction. The measured cross section, σνee− = [10.1 ± 1.1(stat.) ± 1.0(syst.)] × Eνe (MeV) ×10 −45 cm, agrees well with standard model expectations. The measured value of the interference parameter, I = −1.01± 0.13(stat.)± 0.12(syst.), is in good agreement with the standard model expectation of I = −1.09. Limits are placed on neutrino flavorchanging neutral currents. An upper limit on the muon-neutrino magnetic moment of 6.8 × 10μBohr is obtained using the νμ and ν̄μ fluxes from π and μ decay. now at University of Alabama, Tuscaloosa, AL 35487 now at Indiana University, Bloomington, IN 47405