Coauthored the observation of the J/psi meson through a narrow peak near in the invariant mass of electron-Positron pairs. The experiment used a precise pair spectrometer to analyze products of protons striking a beryllium target.[ref]
Experimental Observation of a Heavy Particle J by J. J. Aubert. Abstract: proton-beryllium reaction, pair spectrometer and narrow 3.1 GeV mass peak
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