Measurement of the $B^0$--$\bar B^0$ oscillation frequency $Δm_d$ with the decays $B^0 \to D^- π^+$ and $B^0 \to J/ ψK^{*0}$

Abstract

The $B^0$--$\bar B^0$ oscillation frequency $Δm_d$ is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of $1.0\,$fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 7\,$TeV, and is found to be $Δm_d = 0.5156 \pm 0.0051\,($stat.$) \pm 0.0033\,($syst.$)\,$ps$^{-1}$. The measurement is based on results from analyses of the decays $B^0 \to D^- π^+$ ($D^- \to K^+ π^- π^-$) and $B^0 \to J/ ψK^{*0}$ ($ J/ ψ\to μ^+ μ^-$, $K^{*0} \to K^+ π^-$) and their charge conjugated modes.

17 pages, 3 figures, 1 table