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Physical Review D 87 (2013) 032004
Branching fraction measurement of B \to omega l nu decays
J. P. Lees1, V. Poireau1, V. Tisserand1, N. Arnaud2, M. Davier2, D. Derkach2, G. Grosdidier2, F. Le Diberder2, A. M. Lutz2, B. Malaescu2, P. Roudeau2, M. H. Schune2, A. Stocchi2, G. Wormser2, D. Bernard3, M. Verderi3, S. Akar4, E. Ben-Haim4, M. Bomben4, G.R. Bonneaud3, H. Briand4, G. Calderini4, J. Chauvau4, O. Hamon4, Ph. Leruste4, G. Marchiori4, J. Ocariz4, S. Sitt4
For the BABAR collaboration(s)
(2013)

We present a measurement of the $B \to \omega \ell \nu$ branching fraction based on a sample of 467 million BB pairs recorded by the BaBar detector at the SLAC PEP-2 e+e- collider. We observe $1041 \pm 133$ signal decays, corresponding to a branching fraction of $\BR(B \to \omega \ell \nu$) = (1.15 \pm 0.15 \pm 0.12) \times 10^{-4}$, where the first error is statistical and the second is systematic. The dependence of the decay rate on $q^2$, the momentum transfer squared to the lepton system, is compared to QCD predictions of the form factors based on a quark model and light-cone sum rules.
1:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2:  LAL - Laboratoire de l'Accélérateur Linéaire
3:  LLR - Laboratoire Leprince-Ringuet
4:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1205.6245