The results of the measurement of the e+e−→nnˉ 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.
@article{arxiv.2309.05241,
title = {Measurement of the neutron timelike electromagnetic form factor with the SND detector},
author = {SND Collaboration and M. N. Achasov and A. Yu. Barnyakov and E. V. Bedarev and K. I. Beloborodov and A. V. Berdyugin and D. E. Berkaev and A. G. Bogdanchikov and A. A. Botov and T. V. Dimova and V. P. Druzhinin and V. N. Zhabin and Yu. M. Zharinov and E. V. Kardapoltsev and A. S. Kasaev and D. P. Kovrizhin and I. A. Koop and A. A. Korol and A. S. Kupich and A. P. Kryukov and A. P. Lysenko and N. A. Melnikova and N. Yu. Muchnoy and A. E. Obrazovsky and E. V. Pakhtusova and K. V. Pugachev and S. A. Rastigeev and Yu. A. Rogovsky and S. I. Serednyakov and Z. K. Silagadze and I. K. Surin and Yu. V. Usov and A. G. Kharlamov and Yu. M. Shatunov and D. A. Shtol},
journal= {arXiv preprint arXiv:2309.05241},
year = {2023}
}