Observation of charge-independence-violating effects in anti pd annihilations at rest

For overlinepd annihilations at rest, charge independence and energy conservation imply that the average energy going to charged pions is 〈E_±〉=1241±2 MeV per annihilation. Experimentally this number is found to be 1169 ± 10 MeV after corrections for events with invisible K⁰overlineK⁰. This discrepancy of 72 ± 10 MeV cannot be accounted for by the known η and ω production which is estimated to contribute 14 ± 3 MeV.