18.1 Mass

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

\[\begin{gather} \chi^2/d.o.f.=0.359201 \\ P[0]=0.27347\pm (2.7e-05) \\ P[1]=0.456531\pm (0.23) \\ \end{gather}\] {\[\begin{gather} C=\begin{pmatrix} 7.41e-10& -0.849\\ -0.849& 0.0533\\ \end{pmatrix} \end{gather}\]}