Measurement of electron-neutrino electron elastic scattering
LSND Collaboration, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. VanDalen, W. Vernon, N. Wadia, D. H. White, S. Yellin
Abstract
The cross section for the elastic scattering reaction nue+e- -> nue+e- was measured by the Liquid Scintillator Neutrino Detector using a mu+ decay-at-rest nue 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, sigmanue e-=[10.1 +- 1.1(stat.) +- 1.0(syst.)]x Enue (MeV) x 10-45 cm2, 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 ISM=-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 muBohr is obtained using the numu and numu fluxes from pi+ and mu+ decay.
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