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Experimental study of the $e^+e^-\to n\bar n$ process at the VEPP-2000 $e^+e^-$ collider with the SND detector

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arxiv 2206.13047 v1 pith:ZMLU5QN7 submitted 2022-06-27 hep-ex

classification hep-ex
keywords formcollidercrossdetectorfactormeasuredneutronprocess
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

The process $e^+e^-\to n\bar n$ is studied in the experiment at the VEPP-2000 $e^+e^-$ collider with the SND detector. The technique of the time measurements in the multichannel NaI(Tl) electromagnetic calorimeter is used to select nnbar events. The value of the measured cross section in the center-of-mass energy range from 1.894 to 2 GeV varies from 0.5 to 0.35 nb. The effective neutron timelike form factor is derived from the measured cross section and compared with the proton form factor. The ratio of the neutron electric and magnetic form factors is obtained from the analysis of the antineutron polar angle distribution and found to be consistent with unity.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Understanding the near-threshold structures in $e^+e^- $ annihilation from a unified $N \bar N$-interaction perspective

    hep-ph 2026-07 conditional novelty 5.0 of 10

    Near-threshold structures in seven e+e- annihilation channels are simultaneously described by a single chiral-EFT N Nbar final-state interaction plus slowly varying short-distance sources, without channel-specific nar...

  2. Electromagnetic nucleon form factors in the extended vector meson dominance model

    hep-ph 2024-12 conditional novelty 4.0 of 10

    A six-parameter extended vector meson dominance model with four rho/omega radial excitations per channel is fitted to world data on nucleon form factors, giving a moderate but physically constrained description.

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