= One-loop critical-mass subtraction
{title2=$A(T-T_C)=R[1+(g/2)J_D(R)]$}
For a scalar quartic interaction $g\phi^4/4!$, the tadpole relation $R=r_\Lambda+(g/2)I_D(R)$ can be subtracted at the critical point. When $I_D(0)$ exists, $A(T-T_C)=R[1+(g/2)J_D(R)]$, with $J_D(R)=\int d^Dp\,(2\pi)^{-D}/[p^2(p^2+R)]$. This integral is finite as $R\to0$ only above four dimensions and is logarithmic at four. A self-consistent one-loop relation is not an exact interacting critical-exponent formula.
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