报告题目：Unraveling the physical meaning of the Jaffe-Manohar decomposition of the nucleon spin 

　　报告人：Prof. Masashi Wakamatsu (Osaka Univ.) 

　　时间安排：2017年4月6日 15：00         

　　地点：中国科学院近代物理研究所5号楼1008会议室 

　　Abstract: A general consensus now is that there are two physically inequivalent complete decompositions of the nucleon spin, i.e. the decomposition of the canonical type and that of mechanical type. The well-known Jaffe-Manohar decomposition is of the former type. Unfortunately, there is a wide-spread misbelief that this decomposition matches the partonic picture, which states that motion of quarks in the nucleon is approximately free. In the present talk, we reveal that this understanding is not necessarily correct and that the Jaffe-Manohar decomposition is not such a decomposition, which natively reflects the intrinsic (or static) orbital angular momentum structure of the nucleon.