Evidence for $B^{+}\to \omega l^{+}\nu$

Abstract

We have searched for the decay $B^{+}\to \omega l^{+}\nu$ ($l=e$ or $\mu$) in 78 fb${}^{-1}$ of ${\rm Y}(4S)$ 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.

9 pages, 1 figure

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