\[
\int
\frac{\mathrm{d}^dk}{(2\pi)^d}
\frac{k^{2a}}{(k^2-\Delta)^b}
=\mathrm{i}(-1)^{a-b}
\frac{1}{(4\pi)^{d/2}}
\frac{1}{\Delta^{b-a-\frac{d}{2}}}
\frac{\Gamma(a+\frac{d}{2})\Gamma(b-a-\frac{d}{2})}{\Gamma(b)\Gamma(\frac{d}{2})}
\]
\[
\int
\frac{\mathrm{d}^dk}{(2\pi)^d}
\frac{k^{2a}}{(k^2-\Delta)^b}
=\mathrm{i}(-1)^{a-b}
\frac{1}{(4\pi)^{d/2}}
\frac{1}{\Delta^{b-a-\frac{d}{2}}}
\frac{\Gamma(a+\frac{d}{2})\Gamma(b-a-\frac{d}{2})}{\Gamma(b)\Gamma(\frac{d}{2})}
\]