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 426.1fb-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.

Measurement of the B^{+}→ωℓ^{+}ν branching fraction with semileptonically tagged B mesons / J. P., L., V., P., V., T., E., G., A., P., G., E., B., S., D. N., B., L. T., K., Kolomensky, Y.u.G., M. J., L., G., L., H., K., T., S., C., H., T. S., M., J. A., M., R. Y., S.o., A., K., V. E., B., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 88:(2013), pp. 072006-1-072006-8. [10.1103/PhysRevD.88.072006]

Measurement of the B^{+}→ωℓ^{+}ν branching fraction with semileptonically tagged B mesons

LANCERI, LIVIO;VITALE, LORENZO;
2013-01-01

Abstract

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 426.1fb-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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2769160
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