Penguin contribution to width difference and CP asymmetry in $B_q$-${\bar{B}}_q$ mixing at order ${\alpha }_s^2{N}_f$

Hrachia M. Asatrian, Hrachya H. Asatryan, Artyom Hovhannisyan +3

We present new contributions to the decay matrix element ${\Gamma }_{12}^q$ of the $B_q$-${\bar{B}}_q$ mixing complex, where $q=d$ or $s$. Our new results constitute the order ${\alpha }_s^2{N}_f$ cor…