Chapter 12 Fit QC3

minimizing the $\chi^2$ $$\chi^2 =\sum_i \frac{(E_3^{predicted} -E_3^{measured} )}{\sigma^2}$$ the predicted energy is the solution of the three particles quantization condition in the isotropic approximation $$F_3^{iso}(E,\vec P,L)=-1/K^{iso}_3(E^*)\,$$ $F_3$ depend on the result of the two particle phase shift $\delta$ computed before and $K_3^{iso}$ is parametrised as

$$K_3^{iso}= K^0_3+ \Delta K^1_3$$ with $\Delta=(E_{cm}^2 -9 m^2)$

$T$	$L$	$E_3/m$	err
32	24	3.18188	0.01900420
32	28	3.11606	0.01504940
32	30	3.08234	0.00984515
32	32	3.06695	0.02354710
32	36	3.03299	0.00928475