A precise measurement of the $B^0$ meson oscillation frequency

LHCb collaboration, R. Aaij, C. Abellán Beteta +730

The oscillation frequency, $\Delta m_d$, of $B^0$ mesons is measured using semileptonic decays with a $D^{-}$ or $D^{\ast -}$ meson in the final state, in a data sample of $pp$ collisions coll…