Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-06-30
eConf C0304052 (2003) WG116
Physics
High Energy Physics
High Energy Physics - Experiment
Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052). 4 pages LaTeX,2 eps figu
Scientific paper
We have searched for the decay B^+ -> omega l^+ nu in 78 fb^-1 of Y(4S) data (85.0 million BBbar events) accumulated with the Belle detector. The final state is fully reconstructed using the omega decay into pi^+ pi^- pi^0 and the detector hermeticity to infer the neutrino momentum. The signal yield is extracted by a two-dimensional fit to the lepton momentum and the invariant p^i+ pi^- pi^0 mass. The result of the fit depends on the form factor model assumed for the decay. Taking the average over three different models, 421 +/- 132 events are found in the data corresponding to a preliminary branching fraction of (1.4 +/- 0.4(stat) +/- 0.2(syst) +/- 0.3(model)) * 10^-4.
for the Belle Collaboration
Schwanda Christoph
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