Recent Results on Flavor Physics from BaBar

TL;DR

This paper presents recent experimental results from BaBar on flavor physics, including measurements of CKM matrix elements, charm meson decay constants, mixing parameters, CP violation searches, and lepton flavor violation in tau decays.

Contribution

It provides updated measurements and new searches across multiple flavor physics sectors, enhancing understanding of Standard Model parameters and potential new physics.

Findings

Updated |V_{ub}| measurement from B→πℓν decays

Measurement of f_{Ds} using D_s→τν decays

Search for lepton flavor violation in τ decays

Abstract

We report an update to our previous measurement of the CKM element $|V_{ub}|$ using exclusive $B \rightarrow \pi \ell \nu$ decays. In the charm sector we have performed a measurement of $f_{Ds}$ using $D_s\rightarrow\tau^+\nu_{\tau}$ decays, we have measured the mixing parameter $y_{CP}$ using the lifetime ratio $\frac{\langle\tau_{K\pi}\rangle}{\langle\tau_{hh}\rangle}$ in $D^0$ decays, and we have also searched for CP violation using T-odd correlations in $D^0$ decays to $K^+K^-\pi^+\pi^-$. Finally, in the tau sector we have performed a search for the lepton flavor violating decays $\tau^\pm \rightarrow e^\pm \gamma$ and $\tau^\pm \rightarrow \mu^\pm \gamma$.