Bd mixing measurements with the BABAR detector

TL;DR

This paper reports precise measurements of the $B^0ar{B^0}$ oscillation frequency $\Delta m_d$ using various decay channels with the BaBar detector, improving understanding of B meson mixing.

Contribution

It presents a new simultaneous measurement of $\Delta m_d$ and $ au_{B^0}$ using exclusive $B^0 o D^{*-}l^+ u_l$ decays, along with reviews of other decay-based measurements.

Findings

Measured $\Delta m_d$ as 0.500 ± 0.008 ± 0.006 ps^{-1}

Combined results from multiple decay channels

Enhanced precision in B meson mixing parameters

Abstract

The $B^0\bar{B^0}$ oscillation frequency $\Delta m_d$ has been measured with the BaBar detector at the PEP-II asymmetric $B$ factory with different experimental techniques. The discussion here is focused on the recent simultaneous measurement of $\Delta m_d$ and $\tau_{B^0}$ with exclusively reconstructed $B^0 \to D^{*-}l^+\nu_l$ decays, based on 23 million $B\bar{B}$ pairs collected by BaBar. The measurements of $\Delta m_d$ with fully reconstructed hadronic decays and with dilepton events are also reviewed. The average BaBar result is $\Delta m_d = 0.500 \pm 0.008 \pm 0.006$ $ps^{-1}$.