Three-body interactions from the finite-volume QCD spectrum
Three-body interactions from the finite-volume QCD spectrum
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DOI：
10.1103/physrevd.104.014501
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发表时间：
2021-01
影响因子：
5
通讯作者：
R. Brett;C. Culver;M. Mai;A. Alexandru;M. Döring;F. Lee
中科院分区：
文献类型：
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作者：
R. Brett;C. Culver;M. Mai;A. Alexandru;M. Döring;F. Lee
我们对三个π介子在最大同位旋下的有限体积 QCD 谱进行拟合，以约束三体力。我们使用基于酉性的相对论三粒子量子化条件，在双味 QCD 中获得 315 MeV 和 220 MeV π 介子质量下的 GWUQCD 谱。对于较重的π介子质量，我们发现数据与接近于零的常数接触项一致，而对于较轻的质量，我们发现张力与主阶 ChPT 的预测存在统计上显着的能量依赖性。我们的结果还表明，如果三体能量水平足够，二体振幅可能会受到限制。
We perform a fit of the finite-volume QCD spectrum of three pions at maximal isospin to constrain the three-body force. We use the unitarity-based relativistic three-particle quantization condition, with the GWUQCD spectrum obtained at 315 MeV and 220 MeV pion mass in two-flavor QCD. For the heavier pion mass we find that the data is consistent with a constant contact term close to zero, whereas for the lighter mass we see a statistically significant energy dependence in tension with the prediction of leading order ChPT. Our results also suggest that with enough three-body energy levels, the two-body amplitude could be constrained.