摘要
Based on the recent precise measurements by the BESIII collaboration for electron–positron annihilation into a neutron and antineutron pair,the effective form factors of the neutron were determined in the time-like region,and it was found that the effective form factors of the neutron are smaller than those of the proton.The effective form factors of the neutron show a periodic behaviour,similar to those of the proton.Here,a comparative analysis forΛ,∑^(0)and■hyperons is performed.Fits of the available data on the effective form factors ofΛ,∑^(0)and■with zero charge show an interesting phenomenon in the oscillating behavior of their effective form factors.However,this will need to be confirmed by future precise experiments.Both theoretical and experimental investigations of this phenomenon can shed light on the reaction mechanisms of the electron–positron annihilation processes.
作者
An-Xin Dai
Zhong-Yi Li
Lei Chang
Ju-Jun Xie
代安鑫;李中义;常雷;谢聚军(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000 China;School of Nuclear Science and Technology,University of Chinese Aeademy of Sciences,Beijing 101408,China;School of Physics,Nankai University,Tijin 300071,China;School of Physics and Microelectronics,Zhengzhou University,Zhengzhou,Henan 450001,China;Lanzhou Center for Theoretical Physics,Key Laboratory of Theoretical Physics of Gansu Province,Lanzhou University,Lanzhou 730000,China)
基金
partly supported by the National Natural Science Foundation of China (12075288, 12135007, 11735003, 11961141012)
partly supported by the Youth Innovation Promotion Association CAS
