A0ToB0 is an option for A0. If set to True, A0[m^2] is expressed by (1 + B0[0, m^2, m^2]) m^2.
A0ToB0
A0
True
A0[m^2]
(1 + B0[0, m^2, m^2]) m^2
Overview, A0, B0, C0, D0, PaVe.
A0(m2)\text{A}_0\left(m^2\right)A0(m2)
A0[m^2, A0ToB0 -> True]
−2m2 B0(0,m2,m2)2−D-\frac{2 m^2 \;\text{B}_0\left(0,m^2,m^2\right)}{2-D}−2−D2m2B0(0,m2,m2)