$ e^+e^ - \ to n \ bar n $进程的实验研究在VEPP-200 $ e^+e^ - $ collider与SND检测器

论文标题

$ e^+e^ - \ to n \ bar n $进程的实验研究在VEPP-200 $ e^+e^ - $ collider与SND检测器

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

论文作者

Achasov, M. N., Barnyakov, A. Yu., Beloborodov, K. I., Berdyugin, A. V., Berkaev, D. E., Bogdanchikov, A. G., Botov, A. A., Chizhik, G. S., Dimova, T. V., Druzhinin, V. P., Kardapoltsev, L. V., Kharlamov, A. G., Kladov, V. A., Koop, I. A., Korol, A. A., Kovrizhin, D. P., Kupich, A. S., Lysenko, A. P., Melnikova, N. A., Muchnoi, N. Yu., Obrazovsky, A. E., Pakhtusova, E. V., Perevedentsev, E. A., Pugachev, K. V., Serednyakov, S. I., Silagadze, Z. K., Shatunov, P. Yu., Shatunov, Yu. M., Shtol, D. A., Shwartz, D. B., Surin, I. K., Usov, Yu. V., Zemlyansky, I. M., Zhabin, V. N., Zhulanov, V. V.

论文摘要

该过程$ e^+e^ - \ to n \ bar n $在VEPP-2000 $ e^+e^ - $ collider的实验中研究了SND检测器。多通道NAI（TL）电磁热量表中的时间测量技术用于选择NNBAR事件。质量中心能量中测得的横截面的值在1.894至2 GEV范围为0.5至0.35 nb。有效的中子序列形式是从测得的横截面得出的，并与质子外形进行了比较。中子电和磁性因子的比率是通过对抗神经极角分布的分析获得的，并发现与统一一致。

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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