Measurement of the neutron timelike electromagnetic form factor with the SND detector

Abstract

The results of the measurement of the $e^{+}{e}^{-}\to n\bar{n}$ cross section and effective neutron timelike form factor are presented. The data taking was carried out in 2020-2021 at the VEPP-2000 $e^{+}{e}^{-}$ collider in the center-of-mass energy range from 1891 to 2007 MeV. The general purpose nonmagnetic detector SND is used to detect neutron-antineutron events. The event selection is performed using the time-of-flight technique. The measured cross section is 0.4-0.6 nb. The neutron form factor in the energy range under study varies from 0.3 to 0.2.

13 pages, 8 figures