New Results on Leptonic B meson decays at BaBar

TL;DR

This paper reports new experimental limits on rare leptonic B meson decays from BaBar, finding no evidence for these processes and setting upper bounds on their occurrence rates.

Contribution

The study provides the first or improved upper limits on several leptonic B meson decay modes, advancing the search for physics beyond the Standard Model.

Findings

No evidence for the decay modes observed.

Upper limits set on branching fractions.

Constraints on new physics models.

Abstract

We present selected new results on leptonic B meson decays from the BaBar experiment: searches for the decays B0->l+l-, B+->l+nu and B0->l+tau-, and B->Knunubar, where l=e or mu. The decay modes imply also their charge conjugations. We observe no evidence for these decays and set upper limits on their branching fractions.