Evidence for $B^+\toωl^+ ν$

Details Evidence for $B^+\toωl^+ ν$ Evidence for $B^+\toωl^+ ν$

2004-02-13

arxiv.org/abs/hep-ex/0402023v2

Phys.Rev.Lett.93:131803,2004

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.93.131803

We have searched for the decay $B^+\to\omega l^+\nu$ ($l=e$ or $\mu$) in 78 fb$^{-1}$ of $\Upsilon(4S)$ data (85 million $B\bar B$ events) accumulated with the Belle detector. The final state is fully reconstructed using the $\omega$ decay into $\pi^+\pi^-\pi^0$, combined with detector hermeticity to estimate the neutrino momentum. A signal of $414\pm 125$ events is found in the data, corresponding to a branching fraction of $(1.3\pm 0.4\pm 0.2\pm 0.3)\times 10^{-4}$, where the first two errors are statistical and systematic, respectively. The third error reflects the estimated form-factor uncertainty.

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