7.1 Mass

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

$$\begin{gather} \chi^2/d.o.f.=0.144535 \\ P[0]=0.246346\pm (4.2e-05) \\ P[1]=0.364011\pm (0.088) \\ \end{gather}$$ { $$\begin{gather} C=\begin{pmatrix} 1.78e-09& -0.871\\ -0.871& 0.00771\\ \end{pmatrix} \end{gather}$$ }