What have we learned from annihilations at rest?
T.E. Kalogeropoulos · CERN Document Server (European Organization for Nuclear Research) · 1974
A recent test of charge independence and the results are outlined. The difference E/sub pi (+or-)//sup C.I/-E/sub pi (+or-)//sup OB/= (74+or-10) MeV is obtained, which may be explained by the existence of many NN s-channel narrow resonances. (0 refs).