Measurement of the B+ -> omega l+ nu and B+ -> eta l+ nu Branching Fractions

TL;DR

This paper reports precise measurements of the branching fractions for B+ meson decays into omega and eta mesons with a lepton and neutrino, based on a large dataset from the BABAR experiment.

Contribution

First measurement of these specific charmless semileptonic B+ decay branching fractions using extensive data and detailed reconstruction techniques.

Findings

B(B+ -> omega l+ nu) = (1.14 +- 0.16 +- 0.08) x 10^-4

B(B+ -> eta l+ nu) = (0.31 +- 0.06 +- 0.08) x 10^-4

Results improve understanding of B-meson decay processes.

Abstract

We present a study of the charmless semileptonic B-meson decays B+ -> omega l+ nu and B+ -> eta l+ nu. The analysis is based on 383 million BBbar pairs recorded at the Upsilon(4S) resonance with the BABAR detector. The omega mesons are reconstructed in the channel omega -> pi+ pi- pi0 and the eta mesons in the channels eta -> pi+ pi- pi0 and eta -> gamma gamma. We measure the branching fractions B(B+ -> omega l+ nu) = (1.14 +- 0.16 (stat) +- 0.08 (syst)) x 10^-4 and B(B+ -> eta l+ nu) = (0.31 +- 0.06 (stat) +- 0.08 (syst)) x 10^-4.