16.1 Mass

$$E_1(\vec p=0)=M_{\infty}+P[1]\frac{e^{-M_{\infty} L}}{\sqrt{M_{\infty}L}}$$ $P[0]=M_{\infty}$

$$\begin{gather} \chi^2/d.o.f.=0.718076 \\ P[0]=0.272684\pm (4.3e-05) \\ P[1]=0.596748\pm (0.22) \\ \end{gather}$$ { $$\begin{gather} C=\begin{pmatrix} 1.81e-09& -0.89\\ -0.89& 0.0504\\ \end{pmatrix} \end{gather}$$ }