Measurement of the B+ --> eta l+ nu and B+ --> eta' l+ nu Branching Fractions using Upsilon(4S)-->BBbar Events Tagged by a Fully Reconstructed B Meson

2006/07/26 by The BABAR Collaboration, B. Aubert, Aubert, B.
Computer Science · #Algorithms and Data Compression #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · pdf · doi:10.48550/arxiv.hep-ex/0607066

openalex publication_date 2006/07/26 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We report preliminary measurements of the exclusive charmless semileptonic branching fractions of the B+ --> eta l+ nu and B+ --> eta' l+ nu decays. These measurements are based on 316 fb-1 of data collected at the Y(4S) resonance by the BABAR detector. In events in which the decay of one B meson to a hadronic final state is fully reconstructed, the semileptonic decay of the recoiling B meson is identified by the detection of a charged lepton and an eta or eta'. We measure the branching fraction BR(B+ --> eta l+ nu) = (0.84 +/- 0.27 +/- 0.21) x 10-4, where the first error is statistical and the second one systematic. We also set an upper limit on the branching fraction of BR(B+ --> eta l+ nu) < 1.4 x 10-4 and BR(B+ --> eta' l+ nu) < 1.3 x 10^-4 at the 90% confidence level.

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