Akhmetshin, R.R.Amirkhanov, A.N.Anisenkov, A.V.Aulchenko, V.M.Banzarov, V.Sh.Bashtovoy, N.S.Berkaev, D.E.Bondar, A.E.Bragin, A.V.Eidelman, S.I.Epifanov, D.A.Epshteyn, L.B.Erofeev, A.L.Fedotovich, G.V.Gayazov, S.E.Grebenuk, A.A.Gribanov, S.S.Grigoriev, D.N.Ignatov, F.V.Ivanov, V.L.Karpov, S.V.Kazanin, V.F.Koop, I.A.Kirpotin, A.N.Korobov, A.A.Kozyrev, A.N.Kozyrev, E.A.Krokovny, P.P.Kuzmenko, A.E.Kuzmin, A.S.Logashenko, I.B.Lukin, P.A.Mikhailov, K.Yu.Okhapkin, V.S.Otboev, A.V.Pestov, Yu.N.Popov, A.S.Razuvaev, G.P.Ruban, A.A.Ryskulov, N.M.Ryzhenenkov, A.E.Senchenko, A.I.Shatunov, Yu.M.Shatunov, P.Yu.Shebalin, V.E.Shemyakin, D.N.Shwartz, B.A.Shwartz, D.B.Sibidanov, A.L.Solodov, E.P.Talyshev, A.A.Titov, V.M.Tolmachev, S.S.Vorobiov, A.I.Zemlyansky, I.M.Yudin, Yu.V.2019-06-172019-06-1720192019Akhmetshin, R.R., Amirkhanov, A.N., Anisenkov, A.V., Aulchenko, V.M., Banzarov, V.Sh., Bashtovoy, N.S., … Yudin, Y.V.(2019). Observation of a fine structure in e+e−→hadrons production at the nucleon-antinucleon threshold. Physics Letters B, 794, 64-68. https://doi.org/10.1016/j.physletb.2019.05.032https://doi.org/10.1016/j.physletb.2019.05.032http://hdl.handle.net/1828/10926A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 e+e−collider. The very fast rise with about 1 MeV width has been observed in the e+e−→p¯p cross section. A sharp drop in the e+e−→3(π+π−) cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the e+e−→p¯p cross section. For the first 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.enVictoria Subatomic Physics and Accelerator Research Centre (VSPA)ArticleDepartment of Physics and Astronomy