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arXiv 0810.2774nucl-thhep-ph
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双π-交换和其他高阶对$pp\to ppπ^0$反应的贡献

Two-pion-exchange and other higher-order contributions to the $pp\to ppπ^0$ reaction

Y. Kim, T. Sato, F. Myhrer, K. Kubodera

摘要:

近阈值NN \to NNπ反应的有效场论研究已经投入了大量的努力,为了处理涉及的相当大的三动量转移,动量计数方案被提出作为通常的温伯格计数方案的替代方案。为了检验动量计数方案的实用性,我们在这里研究高阶项对pp \to ppπ^0反应的贡献。我们讨论了在这两种计数方案中核子传播子的不同处理的后果。我们还研究了某些更高的手征阶π介子再散射项和五点反项,这些项都给出了重要的贡献。

英文摘要:

Much effort has been invested on effective-field-theoretical studies of the near-threshold NN \to NNπreactions and, in order to deal with the rather large three-momentum transfers involved, the momentum counting scheme was proposed as an alternative to the usual Weinberg counting scheme. To examine the practical utility of the momentum counting scheme, we study here the contributions of higher-order terms to the pp\to ppπ^0 reaction. We discuss the consequences of the different treatments of the nucleon propagators in these two counting schemes. We also investigate certain higher chiral-order pion-rescattering terms and the five-point counter-term, which turn out to give important contributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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