Measurement Of Electron-Neutrino Electron Elastic Scattering

The cross section for the elastic scattering reaction nu (e)+e(-)-->nu (e)+e(-) was measured by the Liquid Scintillator Neutrino Detector using a mu (+) decay-at-rest nu (e) 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, sigma (nu ee)-=[10.1+/-1.1(stat) +/-1.0(syst)]x E-nue (MeV)x 10(-45) cm(2), 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-SM = - 1.09. Limits are placed on neutrino flavor-changing neutral currents. An upper limit on the muon-neutrino magnetic moment of 6.8 x 10(-10) mu (Bohr) is obtained using the nu (mu) and <()over bar>(mu) fluxes from pi (+) and mu (+) decay.