Measurement of the B+ --> omega l+ nu branching fraction with semileptonically tagged B mesons
J. P. Lees
(1)
,
V. Poireau
(1)
,
V. Tisserand
(1)
,
N. Arnaud
(2)
,
M. Davier
(2)
,
D. Derkach
(2)
,
G. Grosdidier
(2)
,
F. Le Diberder
(2)
,
A.M. Lutz
(2)
,
B. Malaescu
(3)
,
P. Roudeau
(2)
,
M.H. Schune
(2)
,
A. Stocchi
(2)
,
G. Wormser
(2)
,
D. Bernard
(4)
,
M. Verderi
(4)
,
S. Emery
(5)
,
G. Hamel de Monchenault
(5)
,
G. Vasseur
(5)
,
Ch. Yèche
(5)
,
S. Akar
(3)
,
E. Ben-Haim
(3)
,
M. Bomben
(3)
,
G.R. Bonneaud
(3)
,
H. Briand
(3)
,
G. Calderini
(3)
,
J. Chauvau
(3)
,
O. Hamon
(3)
,
Ph. Leruste
(3)
,
G. Marchiori
(3)
,
J. Ocariz
(3)
,
S. Sitt
(3)
N. Arnaud
- Fonction : Auteur
- PersonId : 16841
- IdHAL : nicolas-arnaud
- ORCID : 0000-0001-6589-8673
G. Vasseur
- Fonction : Auteur
- PersonId : 745439
- IdHAL : georges-vasseur
M. Bomben
- Fonction : Auteur
- PersonId : 1380362
- ORCID : 0000-0002-9807-861X
- IdRef : 242005462
G. Calderini
- Fonction : Auteur
- PersonId : 10608
- IdHAL : giovanni-calderini
- ORCID : 0000-0002-9495-9145
- IdRef : 172243211
G. Marchiori
- Fonction : Auteur
- PersonId : 741274
- IdHAL : giovanni-marchiori
- ORCID : 0000-0003-2655-7643
- IdRef : 180997203
Résumé
We report a measurement of the branching fraction of the exclusive charmless semileptonic decay B+ --> omega l+ nu, 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 dataset 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 BF(B+ --> omega l+ nu) = (1.35 +/- 0.21 +/- 0.11) x 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.