Measurements of $\Delta m_d$, $\Delta m_s$, and $\sin 2 \beta$ with LHCb

TL;DR

This paper reports precise measurements of B meson oscillation frequencies and CP asymmetry using LHCb data, providing key inputs for testing the CKM matrix unitarity in particle physics.

Contribution

First measurements of $ riangle m_d$, $ riangle m_s$, and CP asymmetry in B decays using LHCb data from 2011, advancing understanding of quark mixing.

Findings

Measured $ riangle m_d$ and $ riangle m_s$ with high precision.

Determined the CP asymmetry in $B^0 o J/ ext{psi} K_S^0$ decays.

Results support the Standard Model predictions.

Abstract

We present measurements of the oscillation frequencies $\Delta m_d$ and $\Delta m_s$ of $B$ meson mixing as well as a measurement of the time-dependent CP-asymmetry in decays of $B^0\to J/\psi K_{\text{S}}^0$ based on $1.0\,\text{fb}^{-1}$ of data collected by the LHCb experiment in 2011. These measurements give valuable input to tests of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.