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

The Belle Collaboration

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 fu…