Abstract

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. The very fast rise with 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 confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the e+e→pp¯ cross section. For the first time a similar sharp drop is demonstrated in the e+e→K+Kπ+π cross section. The behavior of the e+e→3(π+π),K+Kπ+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.

Original languageEnglish
Pages (from-to)64-68
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume794
DOIs
Publication statusPublished - 10 Jul 2019

Keywords

  • NARROW DIP STRUCTURE
  • CROSS-SECTION
  • 1.9 GEV/C(2)
  • ANNIHILATION
  • ENERGY
  • P(P)OVER-BAR

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