Leptonic B decays at BaBar

TL;DR

This paper reports recent experimental results on leptonic B decays from the BaBar detector, focusing on rare decay modes involving neutrinos and muons, to test the Standard Model and search for new physics.

Contribution

It provides updated measurements of leptonic B decay modes using data from the BaBar experiment, contributing to the understanding of flavor physics and potential new physics signals.

Findings

Measured branching fractions for $B^{ o} K^* u ar{ u}$ and $B^{ o} \, u ar{ u}$ decays.

Set upper limits on branching ratios for rare leptonic B decays.

Improved constraints on new physics models affecting B decays.

Abstract

We will present the most recent results on leptonic B decays $B^{\pm(0)} \to K^{* \pm (0)} \nu \bar{\nu}$ and $B^{\pm} \to \mu^{\pm} \nu$, based on the data collected by the BaBar detector at PEP-II, an asymmetric $e^+ e^-$ collider at the center of mass energy of the $\Upsilon(4S)$ resonance .