Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN pp collider

Abstract We report the results of a search for single isolated electrons of high transverse momentum at the CERN p p collider. Above 15 GeV/ c , four events are found having large missing transverse energy along a direction opposite in azimuth to that of the high- p T electron. Both the configuration of the events and their number are consistent with the expectations from the process p + p → W ± + anything , with W→e+ ν , where W ± is the charged Intermediate Vector Boso postulated by the unified electroweak theory.