A search for muon-associated neutrino going to electron-associated neutrino oscillations in a wide-band neutrino beam

Abstract

This is a report on a search for $\nu\sb\mu \to \nu\sb{e}$ oscilliations using the E776 detector at Brookhaven National Laboratory. The detector consisted of a 226 metric ton electromagnetic calorimeter followed by a toroidal muon spectrometer and was located 1 km from the target at the AGS. 1.43 $\times$ 10$\sp{19}$ protons on target were collected in the wide band beam with a peak neutrino energy of 1.1 GeV. No evidence for neutrino oscillations was observed. The 90% confidence limits obtained are $\Delta{m}\sp2 \leq$ 0.13 $eV\sp2$ for large mixing angle, and sin$\sp2$ 2$\theta \leq$ 7.7 $\times$ 10$\sp{-3}$ in the limit of large $\Delta{m}\sp2$.