Cross Section of the Process \({e^{+}e^{-}\to n\bar{n}}\) near the Threshold

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发表日期：

2024年10月7日

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M. N. Achasov,
A. Yu. Barnyakov,
E. V. Bedarev,
K. I. Beloborodov,
A. V. Berdyugin,
A. G. Bogdanchikov,
A. A. Botov,
T. V. Dimova,
V. P. Druzhinin,
V. N. Zhabin,
Yu. M. Zharinov,
L. V. Kardapoltsev,
A. S. Kasaev,
A. A. Kattsin,
D. P. Kovrizhin,
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,
A. I. Senchenko,
S. I. Serednyakov,
Z. K. Silagadze,
I. K. Surin,
Yu. V. Usov,
A. G. Kharlamov,
D. E. Chistyakov,
Yu. M. Shatunov,
S. P. Sherstyuk,
D. A. Shtol

摘要

Abstract

The \(e^{+}e^{-}\to n\bar{n}\) cross section was measured at center of mass (c.m.) energies from the threshold to 1908 MeV. The experiment to measure the cross section has been carried out at the VEPP-2000 \(e^{+}e^{-}\) collider in 13 energy points. The SND detector is used to detect the produced neutron–antineutrons ( \(n\bar{n}\) ) events. A special time measurement system on the calorimeter was used to select the time-delayed \(n\bar{n}\) events. The measured \(e^{+}e^{-}\to n\bar{n}\) cross section is 0.4–0.6 nb. The neutron effective timelike form factor in the energy range under study varies from 0.3 to 0.6.