摘要
A systematic theory on the appropriate spin operators for the relativistic states is developed. For a massive relativistic particle with arbitrary nonzero spin, the spin operator should be replaced with the relativistic one, which is called in this paper as moving spin. Further the concept of moving spin is discussed in the quantum field theory. A new operator, field quanta spin is defined and in terms of the generators of Poincaré group the moving spin of field system is constructed. It is shown that, in virtue of the two operators, problems in quantum field concerned spin can be neatly settled.
基金
国家自然科学基金，高等学校博士学科点专项科研项目，国家重点实验室基金，CTNP of LHIA National Lab of China，国家'211'工程建设项目，中国博士后科学基金
