The Gaugino \beta-Function

We present an elegant exact formula for the gaugino $\beta$-function in a softly-broken supersymmetric gauge theory, of the form $\beta_M = {\cal O}(\beta_g/g)$,where$\beta_g$isthegauge$\beta$functionand${\cal O}$ is a simple differential operator acting on the gauge coupling $g$ and the Yukawa coupling.