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Solodov, E. P.; 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.; Pestov, Yu. N.; Popov, A. S.; Razuvaev, G. P.; Rogovsky, Yu. A.; Ruban, A. A.; Ryskulov, N. M.; Ryzhenenkov, A. E.; Semenov, A. V.; Shatunov, Yu. M.; Shatunov, P. Yu; Shebalin, V. E.; Shemyakin, D. N.; Shwartz, B. A.; Shwartz, D. B.; Sibidanov, A. L.; Titov, V. M.; Talyshev, A. A.; Vorobiov, A. I.; Zemlyansky, I. M.; Yudin, Yu. V.
EPJ Web of Conferences, 2019, Volume: 212Journal Article, Conference Proceeding
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.
