Minimal subtraction scheme

In the similar and more widely used modified minimal subtraction, or MS-bar scheme (${\displaystyle \overline{\text{MS}}}$), one absorbs the divergent part plus a universal constant that always arises along with the divergence in Feynman diagram calculations into the counterterms. When using dimensional regularization, i.e. ${\displaystyle d^{4}p\to {\mu }^{4-d}{d}^{d}p}$, it is implemented by rescaling the renormalization scale: ${\displaystyle {\mu }^2\to {\mu }^2\frac{e^{{\gamma }_{\mathrm{E}}}}{4\pi }}$, with ${\displaystyle {\gamma }_{\mathrm{E}}}$ the Euler–Mascheroni constant.