Measuring the Neutron Timelike Electromagnetic Form Factor with the SND Detector

M. N. Achasov,A. Yu. Barnyakov, E. V. Bedarev,K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev,A. G. Bogdanchikov, A. A. Botov,T. V. Dimova,V. P. Druzhinin,V. N. Zhabin,Yu. M. Zharinov,L. V. Kardapoltsev, A. S. Kasaev, D. P. Kovrizhin, I. A. Koop,A. A. Korol,A. S. Kupich, A. P. Kryukov,A. P. Lysenko,N. A. Melnikova,N. Yu. Muchnoi,A. E. Obrazovsky,E. V. Pakhtusova, K. V. Pugachev,S. A. Rastigeev,Yu. A. Rogovsky,S. I. Serednyakov, Z. K. Silagadze,I. K. Surin,Yu. V. Usov, A. G. Kharlamov,Yu. M. Shatunov, D. A. Shtol

Physics of Atomic Nuclei（2023）

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摘要

Results are presented from measuring the e^+e^-→ nn̅ cross section and effective neutron timelike form factor. Data are collected in 2020–2021 at the VEPP-2000 e^+e^- collider in the 1891 to 2007 MeV center-of-mass range of energies. The general purpose nonmagnetic SND detector is used to detect neutron–antineutron events. The time-of-flight approach is used to select nn̅ events. The measured cross section is 0.4–0.6 nbn. The neutron form factor in the investigated range of energies varies from 0.3 to 0.2.

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