Observation of a fine structure in $e^+ e^− \to$ hadrons production at the nucleon-antinucleon threshold - INSPIRE

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Observation of a fine structure in $e^+ e^− \to$ hadrons production at the nucleon-antinucleon threshold

CMD-3

Collaboration

•

R.R. Akhmetshin
(
- Novosibirsk, IYF and
- Novosibirsk State U.
)

Jul 31, 2018

5 pages

Published in:

Phys.Lett.B 794 (2019) 64-68

Published: Jul 10, 2019

e-Print:

1808.00145 [hep-ex]

DOI:

10.1016/j.physletb.2019.05.032 (publication)

Experiments:

NOVOSIBIRSK-CMD-3

View in:

ADS Abstract Service

reference search48 citations

Citations per year

Abstract: (Elsevier)

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+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.

Note:

7 pages, 5 figures

13.66.Bc
14.40.Cs
13.25.Gv
13.25.Jx
13.20.Jf
electron positron: annihilation
electron positron: colliding beams
pi: multiple production
K: pair production
hadron: electroproduction

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