Results on {ital {nu}}{sub {ital {ital {mu}}}} {r_arrow} {ital {nu}}{sub {ital {ital e}}} Neutrino Oscillations from the LSND Experiment

A search for {nu}{sub {mu}}{r_arrow}{nu}{sub e} oscillations has been conducted with the LSND apparatus using {nu}{sub {mu}} from {pi}{sup +} decay in flight. Two analyses observe a total of 40 beam-on high-energy (60{endash}200 MeV) electron events consistent with the {nu}{sub e}thinspC{r_arrow}e{sup {minus}} thinspX inclusive reaction. This number is significantly above the 21.9{plus_minus}2.1 events expected from the {nu}{sub e} contamination in the beam and the beam-off background. If interpreted as an oscillation signal, the observed oscillation probability of (2.6{plus_minus}1.0{plus_minus}0.5){times}10{sup {minus}3} is consistent with the previously reported {ovr {nu}}{sub {mu}}{r_arrow}{ovr {nu}}{sub e} oscillation evidence from LSND. {copyright} {ital 1998} {ital The American Physical Society}