Experimental observation of isolated large transverse energy electrons with associated missing energy at $\sqrt s$ = 540 GeV

Abstract We report the results of two searches made on data recorded at the CERN SPS Proton-Antiproton Collider: one for isolated large- E T electrons, the other for large- E T neutrinos using the technique of missing transverse energy. Both searches converge to the same events, which have the signature of a two-body decay of a particle of mass ∼80 GeV/ c 2 . The topology as well as the number of events fits well the hypothesis that they are produced by the proces p + p → W ± + X , with W ± →e ± + ν ; where W ± is the Intermediate Vector Boson postulated by the unified theory of weak and electromagnetic inter- actions.