B0[pp, ma^2, mb^2] is the Passarino-Veltman two-point integral B_0. All arguments are scalars and have dimension mass squared. If the option BReduce is set to True, certain B0’s are reduced to A0’s. Setting the option B0Unique to True simplifies B0[a,0,a] and B0[0,0,a].
B0[SP[p, p], m^2, m^2]\text{B}_0\left(\overline{p}^2,m^2,m^2\right)
B0[0, 0, m^2, B0Unique -> True, B0Real -> True]\text{B}_0\left(0,m^2,m^2\right)+1
B0[m^2, 0, m^2, B0Unique -> True, B0Real -> True]\text{B}_0\left(0,m^2,m^2\right)+2
B0[0, m^2, m^2]\text{B}_0\left(0,m^2,m^2\right)