A new implementation of estimating the two-to-two $K$-matrix fromfinite-volume energies based on the Luescher formalism is described. The methodincludes higher partial waves and multiple decay channels, and the fittingprocedure properly includes all covariances and statistical uncertainties. Themethod is also simpler than previously used procedures. Formulas and softwarefor handling total spins up to $S=2$ and orbital angular momenta up to $L=6$are presented.
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机译：描述了一种新的实现方法，该方法基于Luescher形式主义，从有限体积能量估计两到两个$ K $-矩阵。该方法包括较高的分波和多个衰减通道，并且拟合过程适当地包括所有协方差和统计不确定性。该方法也比以前使用的过程更简单。提出了用于处理高达$ S = 2 $的总自旋和高达$ L = 6 $的轨道角矩的公式和软件。
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