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A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000  e  +  e  −  collider. A very fast rise with an about 1 MeV width has been observed in the  e  +  e  − →  pp ̅ cross section. A sharp drop in the  e  +   e  − → 3(π + π − ) cross section has been con?rmed and found to have a width of less than 2 MeV, in agreement with the observed fast rise of the  e  +  e  − →  pp ̅ cross section. For the ?rst time a similar sharp drop is demonstrated in the  e  +  e  − →  K  +   K  − π + π −  cross section. The behavior of the  e  +  e  − → 3(π +  π − ),  K  +   K  − π + π −  cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the  e  +  e  − → 2(π + π − ) cross section.

The NNbar and multihadron production at the threshold at VEPP2000