Chiral 2 π exchange at fourth order and peripheral NN scattering
Chiral 2 π exchange at fourth order and peripheral NN scattering
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DOI：
10.1103/physrevc.66.014002
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发表时间：
2002-02
影响因子：
3.1
通讯作者：
D. R. Entem;R. Machleidt
中科院分区：
文献类型：
--
作者：
D. R. Entem;R. Machleidt
我们计算了手征四阶（也称为次-主导阶）两π交换贡献的完整集合对核子-核子散射的周边分波的影响。我们的计算是基于Kaiser的分析研究。结果表明，四阶的贡献远小于三阶的贡献，表明手征展开的收敛性。我们比较预测手征π介子交换与相应的一个从传统的介子理论所代表的波恩完整的模型，并发现，在一般情况下，良好的协议。我们的计算提供了一个良好的基础，调查的问题是否从$\ensuremath{\pi}N$确定的低能常数导致合理的预测$\mathrm{NN}。
We calculate the impact of the complete set of two-pion exchange contributions at chiral fourth order (also known as next-to-next-to-next-to-leading order) on peripheral partial waves of nucleon-nucleon scattering. Our calculations are based upon the analytical studies by Kaiser. It turns out that the contribution of fourth order is substantially smaller than the one of third order, indicating convergence of the chiral expansion. We compare the prediction from chiral pion exchange with the corresponding one from conventional meson theory as represented by the Bonn full model and find, in general, good agreement. Our calculations provide a sound basis for investigating the issue whether the low-energy constants determined from $\ensuremath{\pi}N$ lead to reasonable predictions for $\mathrm{NN}.$