The Excess of Negative Over Positive Mesons Produced by High Energy Photons

Mesons produced by the high energy photon beam from the University of California Radiation Laboratory 330 Mev synchrotron are found to show an excess of negatives over positives. (1) With a carbon target, observing mesons in the energy range 30-130 Mev at 90© to the photon beam, the ratio of negative to positive mesons is 1.7 ℗± 0.2 with no significant energy dependence.