Burton Richter coauthored an independent 1974 discovery of a narrow resonance in electron–positron annihilation. Scanning the collision energy revealed a sharp increase in production of hadrons and charged-lepton pairs near 3.1 GeV. Unlike reconstructing a decay from a fixed-target beam, this method varied the initial energy to pass directly through the resonance. The complementary measurements helped establish the state now associated with the November 1974 particle discoveries.[ref]
Discovery of a Narrow Resonance in e+e- Annihilation by J.-E. Augustin. 1974 abstract: sharp cross-section peak and measured width limit
Portrait of Burton Richter
. Eddie Adams / Associated Press; 29 November 1976; existing Commons version uploaded by Based5290. Public domain in the United States: publication without copyright notice (PD-US-no-notice). Source usage terms, via Wikimedia Commons. Source.
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