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Attention is brought to a statistically significant ( ∼ 5 σ ) one-bin (20 MeV) enhancement in the π + π - invariant-mass combinations which is present in two independent experiments on the 2 π - 2 π + annihilations at rest. It is shown that the peak is not due to kinematical reflections from other reactions. Suggestions are made for further clarification of this peak.
Physical Review – American Physical Society (APS)
Published: Sep 25, 1969
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