Current-current operator contribution to the decay matrix in $B$-meson mixing at next-to-next-to-leading order of QCD

Marvin Gerlach, Ulrich Nierste, Pascal Reeck +2

We compute next-to-next-to-leading order perturbative corrections to the decay width difference of mass eigenstates and the charge-parity asymmetry $a_{\mathrm{fs}}$ in flavour-specific…