Discovery of J/SPI particle

Discovery of J/SPI particle

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Credit: BROOKHAVEN NATIONAL LABORATORY/SCIENCE PHOTO LIBRARY

Caption: Graph of the data that revealed the J/psi particle quark. The discovery was made independently in November 1974 by a teams at the Brookhaven National Laboratory, led by Sam Ting, & at the Stanford Linear Accelerator Center (SLAC), led by Burt Richter. The graph is of the data from Ting's group & shows a "spike" in the number of electron- positron pairs produced in collisions of a proton beam with a beryllium target. The spike represents a resonance at an energy of 3.1 GeV, the mass of the J/psi. The particle consists of a charm quark bound with a charm antiquark.

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Keywords: burt's quark data, charm quark, discovery, j/psi particle, particle physics, richter, sam's quark data, ting

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