RI-(S)MOM to $\overline{\mathrm{MS}}$ conversion for $B_K$ at two-loop order

Martin Gorbahn, Sebastian Jäger, Sandra Kvedaraitė

The Kaon bag parameter ${\hat{B}}_K$ plays a critical role in constraining the parameters of the CKM matrix and in probing physics beyond the Standard Model. In this work, we imp…