Observation of $B_s^0$-${\bar{B}}_s^0$ mixing and measurement of mixing frequencies using semileptonic B decays

LHCb collaboration, R. Aaij, B. Adeva +657

The $B_s^0$ and $B^0$ mixing frequencies, $\Delta m_s$ and $\Delta m_d$, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1} collected by the LHCb experim…