Lattice determination of I = 0 and 2 p p scattering phase shifts with a physical pion mass
Lattice determination of I = 0 and 2 p p scattering phase shifts with a physical pion mass
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用物理π介子质量确定 I = 0 和 2 p p 散射相移的晶格
DOI：
10.1103/physrevd.104.114506
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发表时间：
2021
影响因子：
5
通讯作者：
Blum T
中科院分区：
文献类型：
--
作者：
Blum T
本文用格点QCD方法计算了741个规范位形在π介子质量和格点尺寸为的情况下的相移。这些结果支持了我们最近2021年对直接违反衰变的研究，改进了我们早期的2015年计算。在三个和四个不同的总动量下，确定了静止和运动系统的相移。我们实现了几个插值算子，包括标量双线性“”算子和成对的单π双线性算子，其组成π子携带各种相对动量。几种技术，包括相关的拟合和自助确定的p值已被用来完善的结果和广义特征值问题方法的比较。进行了详细的系统误差分析，它允许相移结果以固定的能量。
Phase shifts for-wavescattering in both theandchannels are determined from a lattice QCD calculation performed on 741 gauge configurations obeying G-parity boundary conditions with a physical pion mass and lattice size of. These results support our recent 2021 study of directviolation indecay, improving our earlier 2015 calculation. The phase shifts are determined for both stationary and movingsystems, at three () and four () different total momenta. We implement severalinterpolating operators including a scalar bilinear “” operator and paired single-pion bilinear operators with the constituent pions carrying various relative momenta. Several techniques, including correlated fitting and a bootstrap determination of p-values have been used to refine the results and a comparison with the generalized eigenvalue problem method is given. A detailed systematic error analysis is performed which allows phase shift results to be presented at a fixed energy.