A documentation research project to study the complex issues facing the historical documentation of multi-institutional collaborations in physics and allied sciences. BNL-E-650, a Penn/Stony Brook collaboration, was a single experiment, interrupting a series of experiments Penn was already doing using the Single Particle Spectrometer (BNL-E-555 and 635). The purpose of 650 was to use the Single Particle Spectrometer to search, at Brookhaven's energies, for the surprisingly copious production of leptons found at Serphukov, FNAL and the ISR. The copious production initially implied a larger magnitude for R than the Parton Model would permit, but this experiment gave rise to a more mundane explanation. The experiment was approved, and also completed running, in 1974.
From the description of Oral history interviews. Series 1. Selected Experiments: BNL-E-650: Single Electron Production in Proton-Proton Collisions, 1990-1991. (Unknown). WorldCat record id: 80709849