Evidence for B+ ---> omega l+ nu

Collaboration

Feb, 2004

10 pages

Published in:

e-Print:

DOI:

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \omega}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

Experiments:

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Abstract: (arXiv)

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.

Note:

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