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

TL;DR

This paper reports the most precise measurement to date of the $B^0$ meson oscillation frequency, using semileptonic decay data from the LHCb detector, confirming previous results with improved accuracy.

Contribution

It provides the most precise single measurement of $$, combining two decay modes, and demonstrates compatibility with the world average.

Findings

Measured $ = (505.0 \, ext{ns}^{-1})$ with uncertainties

Achieved highest precision for this parameter to date

Results agree with previous measurements and world average

Abstract

The oscillation frequency, $\Delta m_d$, of $B^0$ mesons is measured using semileptonic decays with a $D^-$ or $D^{*-}$ meson in the final state, in a data sample of $pp$ collisions collected by the LHCb detector corresponding to an integrated luminosity of 3.0$\mbox{fb}^{-1}$. A combination of the two decay modes gives $\Delta m_d = (505.0 \pm 2.1 \pm 1.0) \rm \,ns^{-1}$, where the first uncertainty is statistical and the second is systematic. This is the most precise single measurement of this parameter. It is compatible with the current world average and has similar precision.