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Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Authors :
Yu. M. Shatunov
N.M. Ryskulov
V.S. Okhapkin
D. B. Shwartz
A. N. Kirpotin
A. I. Senchenko
D.N. Shemyakin
A.L. Sibidanov
D.N. Grigoriev
P. Yu. Shatunov
F.V. Ignatov
V.E. Shebalin
A.I. Vorobiov
V. L. Ivanov
Yu.N. Pestov
Yu.V. Yudin
P.A. Lukin
A.V. Bragin
E. P. Solodov
N.S. Bashtovoy
A.A. Korobov
B.A. Shwartz
A.S. Popov
G.P. Razuvaev
G.V. Fedotovich
D.E. Berkaev
A.E. Ryzhenenkov
Alexey Talyshev
Vassili Kazanin
R.R. Akhmetshin
S.V. Karpov
E.A. Kozyrev
S.E. Gayazov
A.S. Kuzmin
V.Sh. Banzarov
D.A. Epifanov
K.Yu. Mikhailov
I. A. Koop
A.N. Amirkhanov
A.E. Bondar
A.A. Ruban
V.M. Titov
I.B. Logashenko
V.M. Aulchenko
A.E. Kuzmenko
L.B. Epshteyn
A.N. Kozyrev
S.I. Eidelman
A. V. Otboev
A.A. Grebenuk
S. S. Tolmachev
Ilya Zemlyansky
S.S. Gribanov
A.L. Erofeev
Alexey Anisenkov
P. Krokovny
Source :
Physics Letters B, Vol 794, Iss, Pp 64-68 (2019)
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

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. A very fast rise with about 1 MeV width has been observed in the $e^+e^- \to p\bar p$ cross section. A sharp drop in the $e^+e^- \to 3(\pi^+\pi^-)$ cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the $e^+e^- \to p\bar p$ cross section. For the first time a similar sharp drop is demonstrated in the $e^+e^- \to K^+K^-\pi^+\pi^-$ cross section. The behavior of the $e^+e^- \to 3(\pi^+\pi^-),~ K^+K^-\pi^+\pi^-$ 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 $e^+e^- \to 2(\pi^+\pi^-)$ cross section.<br />Comment: 7 pages, 5 figures

Details

ISSN :
03702693
Volume :
794
Database :
OpenAIRE
Journal :
Physics Letters B
Accession number :
edsair.doi.dedup.....dd0a169f49c1cf0084f85dedc606cb27