Observation of Charge-Independence-Violating Effects inp¯dAnnihilations at Rest

For $\overline{p}d$ annihilations at rest, charge independence and energy conservation imply that the average energy going to charged pions is $〈E_{\pm }〉=1241\mathrm{}\pm 2$ MeV per annihilation. Experimentally this number is found to be 1169 ± 10 MeV after corrections for events with invisible $K^0{\overline{K}}^0$. This discrepancy of 72 ± 10 MeV cannot be accounted for by the known $\eta$ and $\omega$ production which is estimated to contribute ∼ 14 ± 3 MeV.