Branching Fraction for B+ -> pi0 l+ nu, Measured in Upsilon(4S) -> B Bbar Events Tagged by B- -> D0 l- nubar (X) Decays

TL;DR

This paper measures the branching fraction of the B+ -> pi0 l+ nu decay using data from the BABAR detector, employing a tagging method with B- decays to improve measurement precision.

Contribution

It provides a new measurement of the B+ -> pi0 l+ nu branching fraction using a novel tagging technique with semileptonic B- decays.

Findings

Branching fraction measured as (1.80 +/- 0.37 +/- 0.23) x 10^-4

Analysis based on 81 fb^-1 of data at Upsilon(4S)

Utilizes tagged BBbar events with D0 l- nubar decays

Abstract

We report a preliminary branching fraction of (1.80 +/- 0.37(stat.) +/- 0.23(syst.)) x 10^-4 for the charmless exclusive semileptonic B+ -> pi0 l+ nu decay, where l can be either a muon or an electron. This result is based on data corresponding to an integrated luminosity of 81 fb^-1 collected at the Upsilon(4S) resonance with the BABAR detector. The analysis uses BBbar events that are tagged by a B meson reconstructed in the semileptonic B- -> D0 l- nubar (X) decays, where X can be either a gamma or a pi0 from a D* decay.