摘要
In the new versions of the Review of Particle physics (PDG) after the year 2012[1], there list four N3/2? nucleon resonances, N(1520), N(1700), N(1875) and N(2120). The two-star state N(2080) in the previous versions has been split into a three-star N(1875) and a two-star N(2120) based on the evidence from BnGa analysis[2]. Usually the N(1520) and the N(1700) are assigned to states with orbital angular momentum L=1 in quark model, and mixing effect is very important to explain the decay pattern of these states[3].
基金
Major State Basic Research Development Program in China (2014CB845405), National Natural Science Foundation of China (11275235, 11035006)