E+ E- ANNIHILATION NEAR ANTI-N N THRESHOLD

Dalkarov, O.D.; Protasov, K.V.

doi:10.1016/0375-9474(89)90012-2

E+ E- ANNIHILATION NEAR ANTI-N N THRESHOLD

O.D. Dalkarov
(
- Lebedev Inst.
)
,
K.V. Protasov
(
- Lebedev Inst.
)

1989

10 pages

Published in:

Nucl.Phys.A 504 (1989) 845-854

Published: 1989

DOI:

10.1016/0375-9474(89)90012-2

reference search25 citations

Citations per year

Abstract: (Elsevier)

The contribution of nucleon-antinucleon states (real and virtual) to electron-positron annihilation near the N̄N threshold is investigated theoretically. The nucleon electromagnetic form factor in the time-like region is calculated within the coupled-channels model. Its behaviour is shown to be predominantly denned by the nuclear N̄N interaction in the initial state. The neutron form factor does not exceed the proton one. New experimental data, revealing the existence of minima in many-pionic e + e - annihilation cross section near the N̄N threshold, are described. An analysis of the observed irregularity shows an existence of the narrow state in the N̄N system with the mass approximately 1800 MeV and the width about 15 MeV.

electron positron: annihilation
pi: electroproduction
pi: multiple production
nucleon antinucleon: threshold
nucleon antinucleon: interaction
model: coupled channel
nucleon: form factor
channel cross section: energy dependence
meson resonance: (1790)
numerical calculations: interpretation of experiments

References(15)

Figures(0)

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E+ E- ANNIHILATION NEAR ANTI-N N THRESHOLD

Citations per year

First Determination of the Proton Electromagnetic Form-Factors at the Threshold of the Timelike Region

Study of the Reaction e+e−→ppˉe^+ e^- \to p \bar{p}e+e−→ppˉ​ in the Total Energy Range 1925-{MeV} - 2180-{MeV}

Physics at LEAR with low-energy cooled antiprotons

E+ e- Annihilation Into Baryon-anti-Baryon Pairs

preprint Laboratori Nazionali di Frascati

preprint Laboratori Nazionali di Frascati

preprint Laboratori Nazionali di Frascati

ON THE CROSS-SECTION OF ANNIHILATION OF E+ E- ---> HADRONS NEAR N ANTI-N THRESHOLD. (IN RUSSIAN)

Proc. 5th European Symp. on nucleon-antinucleon interactions

preprint no. 37

Baryon Baryon Scattering in a One Boson Exchange Potential Approach. 3. A Nucleon-Nucleon and Hyperon - Nucleon Analysis Including Contributions of a Nonet of Scalar Mesons

Potential scattering

Evidence for the existence of a narrow anti-p n bound state

Study of the Reaction $e^+ e^- \to p \bar{p}$ in the Total Energy Range 1925-{MeV} - 2180-{MeV}