Multipion systems in lattice QCD and the three-pion interaction.
Multipion systems in lattice QCD and the three-pion interaction.
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DOI：
10.1103/physrevlett.100.082004
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发表时间：
2007-10
影响因子：
8.6
通讯作者：
S. Beane;W. Detmold;T. Luu;K. Orginos;M. Savage;A. Torok
中科院分区：
文献类型：
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作者：
S. Beane;W. Detmold;T. Luu;K. Orginos;M. Savage;A. Torok
使用晶格 QCD 计算大约 (2.5 fm)(3) 空间体积 V 中 2、3、4 和 5 pi(+) 的基态能量。通过消除三个 pi(+) 相互作用的主要贡献，这些 n-pi(+) 基态能量的特定组合提供了 pi(+)pi(+) 散射长度的精确提取，与仅涉及两个 pi(+) 的计算获得的结果一致。三 pi(+) 相互作用可以通过形成 n-pi(+) 基态能量的其他组合来隔离。我们发现一个结果与 m_(pi) 较小、类似 352 MeV 的排斥性三 pi(+) 相互作用一致。
The ground-state energies of 2, 3, 4, and 5 pi(+)'s in a spatial volume V approximately (2.5 fm)(3) are computed with lattice QCD. By eliminating the leading contribution from three-pi(+) interactions, particular combinations of these n-pi(+) ground-state energies provide precise extractions of the pi(+)pi(+) scattering length in agreement with that obtained from calculations involving only two pi(+)'s. The three-pi(+) interaction can be isolated by forming other combinations of the n-pi(+) ground-state energies. We find a result that is consistent with a repulsive three-pi(+) interaction for m_(pi) less, similar352 MeV.