Study of electron-neutrino—electron elastic scattering at LAMPF

This is the authors' abstract. We don't add key points for this paper.

Neutrino-electron elastic scattering was observed with a 15-ton fine-grained tracking calorimeter exposed to electron neutrinos from muon decay at rest. The measured νₑe^-→νₑe^- elastic scattering rate of 236±{}35 events yields the total elastic scattering cross section $10.0±{}1.5(stat)±{}0.9(syst)×{}{10}^{{-}45} c{m}²×{}[{E}_{{ν}} (MeV)]$, and a model-independent measurement of the strength of the destructive interference between the charged and neutral currents, $I={-}1.07±{}0.21$, that agrees well with the standard model (SM) prediction $I={-}1.08$. The agreement between the measured electroweak parameters and SM expectations is used to place limits on neutrino properties, such as neutrino flavor-changing neutral currents and neutrino electromagnetic moments. Limits are placed on the masses of new bosons that interact with leptons: for a neutral tensor boson, MT>105 GeV; for a neutral (pseudo)scalar boson, MP,S>47 GeV; for a charged Higgs boson, M_χ⁺>87 GeV; and for a purely left-handed charged (neutral) vector boson, Mₓ>239 (119) GeV.