FeynCalc manual (development version)

A0

A0[m^2] is the Passarino-Veltman one-point integral A_0..

See also

Overview, B0, C0, D0, PaVe.

Examples

By default A_0 is not expressed in terms of B_0.

A0[m^2]

\text{A}_0\left(m^2\right)

SetOptions[A0, A0ToB0 -> True]; 
 
A0[m^2]

-\frac{2 m^2 \;\text{B}_0\left(0,m^2,m^2\right)}{2-D}

SetOptions[A0, A0ToB0 -> False];

According to the rules of dimensional regularization A_0(0) is set to 0.

A0[0]

0

A0[SmallVariable[M^2]]

0