Studies On J/ψ�'P(?)ω Decay With P(?) Final State Interaction

To make progress in the understanding of the matter's internal structure, the investigation of baryons'internal structure and baryons'nature is very necessary. To complete the baryon spectroscopy is one of our aims in the investigation of excited baryons. It's important in understanding the internal structure of baryon and the strong interaction in the nonperturbative quantum chromodynamics (NPQCD) regime. The hadronic decay of J /ψprovides a new effective way to study hadron's physics. J /ψ→NN|-M ( M denotes mesons) decay is a good place of studying N *, When M is a lighter meson, the contribution of nucleon-pole is great. But, when M is a heavier one, likeω, the case is different by incorporating form factor in the consideration of off-shell effect. This indicates that there is something others dominant. This paper is propelled by that to study the J /ψ→pp|-ωdecay with the pp|- final state interaction.In This paper, we use the one-poin-exchange theory to deal with the pp|- final-state interaction, and cut the loop, which is generated by incorporating the final state interaction of pp|- , with on-shell approximation. How to incorporate the two parts and the loop is the main task of this paper.Once loop integral is concerned, we have to deal with the divergence. There are two methods to deal with it, Cut-off Method and Dimensional Regularization Method. After some analysis, we use Cut-off Method to deal with loop integral in this paper. In the last,we make Monte-Carlo simulation for J /ψ→pp|-ωdecay with pp final state interaction, and invariant mass distributions and Dalitz plot are obtained. The results show that the pp final state interaction does not provide important contribution to the J /ψ→pp|-ωdecay. Thus we should consider contributions from other decay mode, such as N * pole. The final state interactions of pωand p|-ωare neglected in this paper. Sequently, in order to know more about the features of J /ψ→ppωprocess, we will study the final state interactions of pω, p|-ωand pp at the same time in J /ψ→pp|-ωdecay.