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pp final state interaction in J/ψ →γpp

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【Author】 ZENG Zhuo-Quan GUO Xin-Heng SHEN Peng-Nian DING Yi-Bing1 College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China 2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 3 College of Physical Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China 4 College of Physics and Technology, Guangxi Normal University, Guilin 541004, China 5 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China

【机构】 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；

【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.更多还原

【Abstract】 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.更多还原

【关键词】 near-threshold enhancement； final state interaction； one pion exchange potential； Jost function；
【Key words】 near-threshold enhancement； final state interaction； one pion exchange potential； Jost function；

【基金】 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)

【文献出处】中国物理C ,Chinese Physics C , 编辑部邮箱 ,2012年05期

【分类号】O572.33
【下载频次】24

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