Branching fraction measurement of B -> omega l nu decays

TL;DR

This paper reports a precise measurement of the B -> omega l nu decay branching fraction using a large dataset, comparing the results to theoretical QCD predictions of form factors.

Contribution

It provides the first detailed measurement of the B -> omega l nu branching fraction with a large data sample and compares the decay rate dependence on q^2 to QCD models.

Findings

Branching fraction BF(B -> omega l nu) = (1.21 +- 0.14 +- 0.08) x 10^{-4}

Observation of 1125 +- 131 signal decays

Decay rate dependence on q^2 matches QCD predictions

Abstract

We present a measurement of the B -> omega l nu branching fraction based on a sample of 467 million BB pairs recorded by the BaBar detector at the SLAC PEP-2 e+e- collider. We observe 1125 +- 131 signal decays, corresponding to a branching fraction of BF(B -> omega l nu) = (1.21 +- 0.14 +- 0.08) x 10^{-4}, where the first error is statistical and the second is systematic. The dependence of the decay rate on q^2, the momentum transfer squared to the lepton system, is compared to QCD predictions of the form factors based on a quark model and light-cone sum rules.