 It was discovered later in 1962 by Connolly, et al.in a 20-inch hydrogen bubble chamber at the Alternating Gradient Synchrotron (AGS) in Brookhaven National Laboratory in Uptown, NY while they were studying collisions at approximately 2.23 GeV/c.In essence, the reaction involved a beam of s being accelerated to high energies to collide with protons.