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J / ψ → N ( ? ) Π p ( ? ) Η p ( ? ) Η ' decay process nucleon pole contribution

Author: ZongHuanHuan
Tutor: LiuJiFeng；ShenPengNian
School: Guangxi Normal University
Course: Theoretical Physics
Keywords: J / ψ decay Contribution to the nucleon pole Away from the shell effect Propagator
CLC: O571.3
Type: Master's thesis
Year: 2005
Downloads: 14
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Abstract


J / ψ decay process research baryon excited state baryon physics research to a new effective way, the two steps decay J / ψ → N ~~ * N | (-) → NN | (-) M (where M refers meson) study as a good place in the intermediate state N ~ *. Intermediate state for the nucleon nucleon pole diagram of the J / ψ → NN | (-) M decay amplitude contribution must be taken into account to obtain reliable information of the N ~ *. Contribution to the item as a background, the process of decay of the amplitude and the N ~~ * decay of the intermediate state process amplitude coherent superposition. Especially when M is the π mesons light meson, the nucleon pole diagram contribution will be quite large, can not be ignored. This paper will focus on the discussion of the J / ψ → NN | (-) M decay process, the contribution of the nucleon pole diagram, where M is the pseudoscalar mesons π, η and η. Nucleon pole diagram of the calculation of the contribution of the J / ψ → NN | (-) M decay, respectively, using the N to * N | (-) the N interaction pseudoscalar (PS) coupling and pseudo vector coupling mode (PV). Taking into account the intermediate state nucleons from the shells, introduced in the nucleon propagator a description of the width of the imaginary part of the off-shell nucleon decay, and on this basis to further consider the impact of the apex angle shape factor. When M = π, the calculation results show that: When added to the imaginary part only in a propagator, will depress the the nucleon pole figure contribution to a certain extent. Compared to the imaginary part of the propagator, the branching ratio of the decay width reduced by about 11%. PS the coupling and PV coupling way branch still reach about 50% and 47% of the nucleon pole contribution is still quite large and can not be ignored. However, when the imaginary part of the propagator and the introduction of the apex angle shape factor, the decay branching ratio to decrease further, compared with the results simply join the top corners shape factor, the branching ratio of the decay width of about 11% . Can be found by comparing the apex angle of the shape factor of the branching ratio than the obvious impact of the branching ratio in the imaginary part of the propagator. Both processing methods are taken into account intermediate nucleon off-shell effect. The apex angle shape factor taking into account the hadron is not a pure point particle, but with the internal structure; propagator in the imaginary part is a departure from the intermediate state nucleon decay width. Branch than the width due to the decay of the nucleon pole diagram of the two treatments given relatively larger in the calculation of nucleon pole diagram of the J / ψ → NN | (-) π decay contribution, these two factors must be taken into account. Therefore, from the J / ψ → NN | (-) π decay to obtain reliable N? Information must be taken into account, the contribution of the nucleon pole diagram.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > Nuclear physics > Radioactive nuclei decay
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