Measurement of the $B^+ \to \omega \ell^+ \nu$ branching fraction with semileptonically tagged B mesons

We report a measurement of the branching fraction of the exclusive charmless semileptonic decay B+→ωℓ+ν, where ℓ is either an electron or a muon. We use samples of B+ mesons tagged by a reconstructed charmed semileptonic decay of the other B meson in the event. The measurement is based on a data set of 426.1 fb-1 of e+e- collisions at a center-of-mass energy of 10.58 GeV recorded with the BABAR detector at the PEP-II asymmetric-energy e+e- storage rings. We measure a branching fraction of B(B+→ωℓ+ν)=(1.35±0.21±0.11)×10-4, where the uncertainties are statistical and systematic, respectively. We also present measurements of the partial branching fractions in three bins of q2, the invariant-mass squared of the lepton-neutrino system, and we compare them to theoretical predictions of the form factors.

Note:

8 pages, 3 postscript figures, submitted to Physical Review D

13.20.He
12.15.Hh
12.38.Qk
14.40.Nd
B+: semileptonic decay
B+: branching ratio: measured
form factor
electron positron: annihilation
B: pair production
final state: (0charm)

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