Nucleon Electromagnetic Form Factors in the Timelike Region

类时空间的核子电磁形状因子

Human beings have never stopped exploring the structure of matter,and are going deeper into smaller scales-quarks and gluons^([1,2]).They are decisive for understanding the internal structure of nucleons,the main source of mass of the visible matter in universe^([3]).The high-precision experiments of the BaBar and BESⅢcollaborations recently have found that the one-dimensional structures-electromagnetic form factors-of protons and neutrons are distorted by several local structures of small magnitude.