pp final state interaction in J/ψ →γpp |
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作者姓名: | 曾卓全 郭新恒 沈彭年 丁亦兵 |
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作者单位: | College of Nuclear Science and Technology,Beijing Normal University;College of Physics and Technology,Guangxi Normal University;Institute of High Energy Physics,Chinese Academy of Sciences;Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator;College of Physical Sciences,Graduate University of Chinese Academy of Sciences |
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基金项目: | Supported by National Natural Science Foundation of China (10675022, 10975018, 10975038, 11035006, 11165005, 11175020);Fundamental Research Funds for the Central Universities;Key-project by the Chinese Academy of Sciences (KJCX3-SYW-N2) |
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摘 要: | The phenomenon of the near ppˉ-threshold enhancement observed in the J/ψ→γ pp decay is studied by using the enhancement factor method with a simpler one-pion-exchange potential between p and p. The Jost function caused by the mentioned potential is perturbatively calculated in the zero-th order approximation, and the corresponding enhancement factor is obtained. It is found that such a final state interaction offers an important contribution to the decay width near the ppˉ-threshold, although it is not large enough. To explain the decay data, a phenomenological factor G(p) with the form of 285500/(m 2 π + p 2 ) should be introduced. A further calculation including the p-dependent bare T -matrix, a more realistic N ˉ N potential and the contribution from the higher-order wave functions would provide a better understanding of the decay data and even the existence of the baryonium ppˉ. The near ppˉ-threshold behavior of the decay width in the J/ψ→π 0 pp process is also discussed.
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关 键 词: | near-threshold enhancement final state interaction one pion exchange potential Jost function |
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