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arXiv 1111.4933hep-phhep-latnucl-exnucl-th
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$πN$散射振幅的相对论手征表示I:Goldberger-Treiman关系

Relativistic chiral representation of the $πN$ scattering amplitude I: The Goldberger-Treiman relation

J. M. Alarcon, J. Martin Camalich, J. A. Oller

摘要:

本文在重子手征微扰理论框架下,采用扩展质量壳层协变方案研究了$πN$散射过程。我们比较在这个计划中获得的描述与以前获得的红外正则化方案,并表明,EOMS实现了最佳的收敛,能够提取可靠的价值观的重要数量的Goldberger-Treiman偏差的分波分析。关于后者,我们解决了长期存在的问题,涉及到提取的Goldberger-Treiman偏差与协变的ChPT,危害的适用性的ChPT的$πN$系统。我们还显示了潜在的么正化技术应用于微扰计算的EOMS计划,使我们能够增加我们的描述的有效性范围高达$\approx 200$兆电子伏的$\sqrt{s}$。

英文摘要:

In this work we study the $πN$ scattering process within the Baryon Chiral Perturbation Theory framework in the covariant scheme of Extended-On-Mass-Shell (EOMS). We compare the description obtained in this scheme with the previously obtained using the Infrared Regularization scheme and show that EOMS accomplishes the best convergence, being able to extract from partial wave analyses reliable values of important quantities as the Goldberger-Treiman deviation. In regard to the latter, we solve the long-standing problem concerning to the extraction of the Goldberger-Treiman deviation with covariant ChPT that jeopardized the applicability of ChPT to the $πN$ system. We also show the potential of the unitarization techniques applied to the perturbative calculation in the EOMS scheme, that allow us to increase the range of validity of our description up to $\approx 200$ MeV in $\sqrt{s}$.

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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