mr: a C++ library for the matching and running of the Standard Model parameters

Understand

We present the C++ program library mr that allows us to reliably calculate the values of the running parameters in the Standard Model at high energy scales.

• The initial conditions are obtained by relating the running parameters in the $\overline{\mathrm{MS}}$ renormalization scheme to observables at lower energies with full two-loop precision.
• The evolution is then performed in accordance with the renormalization group equations with full three-loop precision.
• Pure QCD corrections to the matching and running are included through four loops.