Deconstructing 1S0 nucleon-nucleon scattering
Deconstructing 1S0 nucleon-nucleon scattering
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DOI：
10.1140/epja/i2010-11034-9
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发表时间：
2010-07
期刊：
影响因子：
--
通讯作者：
M. C. Birse
中科院分区：
文献类型：
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作者：
M. C. Birse
本文用扭曲波方法分析了1 S_0通道中核子-核子散射。通过使用修改的有效范围扩展，从所有阶的经验相移中消除了一π交换的影响。然后在扭曲波玻恩近似中减去2 π交换，在1 π交换势的散射波之间取矩阵元。剩余短程相互作用在动能大于100 MeV时表现出非常快的能量依赖性，这表明相应的有效理论的击穿尺度仅为270 MeV。这可能意味着需要将共振作为一个明确的自由度，以描述在这些能量下的散射。另一种策略，保持截止有限，以减少大，但有限的，从远程部队的贡献进行了讨论。
A distorted-wave method is used to analyse nucleon-nucleon scattering in the1S0channel. Effects of one-pion exchange are removed from the empirical phase shift to all orders by using a modified effective-range expansion. Two-pion exchange is then subtracted in the distorted-wave Born approximation, with matrix elements taken between scattering waves for the one-pion exchange potential. The residual short-range interaction shows a very rapid energy dependence for kinetic energies above about 100MeV, suggesting that the breakdown scale of the corresponding effective theory is only 270MeV. This may signal the need to include the-resonance as an explicit degree of freedom in order to describe scattering at these energies. An alternative strategy of keeping the cutoff finite to reduce large, but finite, contributions from the long-range forces is also discussed.