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Measurement of the B^{0}→π^{-}ℓ^{+}ν and B^{+}→η^{(′)}ℓ^{+}ν branching fractions, the B^{0}→π^{-}ℓ^{+}ν and B^{+}→ηℓ^{+}ν form-factor shapes, and determination of |V_{ub}|

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BABAR Collaboration (Including: Gershon, T. J. and Harrison, P. F.). (2011) Measurement of the B^{0}→π^{-}ℓ^{+}ν and B^{+}→η^{(′)}ℓ^{+}ν branching fractions, the B^{0}→π^{-}ℓ^{+}ν and B^{+}→ηℓ^{+}ν form-factor shapes, and determination of |V_{ub}|. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 83 (Number 5). 052011. doi:10.1103/PhysRevD.83.052011

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Official URL: http://dx.doi.org/10.1103/PhysRevD.83.052011

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Abstract

We report the results of a study of the exclusive charmless semileptonic decays, B(+) -> eta(l)l(+)nu and B(0) -> pi(-)l(+)nu undertaken with approximately 464 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B(+) -> eta l(+)nu and B(0) -> pi(-)l(+)nu decays in three and 12 bins of q(2), respectively, from which we extract the f (+)(q(2)) form-factor shapes and the total branching fractions B(B(+) -> eta l(+)nu)= (0.36 +/- 0.05(stat) +/- 0.04(syst)) x 10(-4) and B(B(0) -> pi(-)l(+)nu) = (1.42 +/- 0.05(stat) +/- 0.07(syst)) x 10(-4). We also measure B(B(+) -> eta'l(+)nu) = (0.24 +/- 0.08(stat) +/- 0.03(syst)) x 10(-4). We obtain values for the magnitude of the CKM matrix element |V(ub)| using three different QCD calculations.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Branching fractions (Nuclear physics)
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Official Date: 24 March 2011
Dates:
DateEvent
24 March 2011Published
Volume: Volume 83
Number: Number 5
Page Range: 052011
DOI: 10.1103/PhysRevD.83.052011
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: United States. Dept. of Energy, National Science Foundation (U.S.) (NSF), Natural Sciences and Engineering Research Council Canada (NSERC), France. Commissariat à l'énergie atomique (CEA), Institut national de physique nucléaire et de physique des particules (IN2P3), Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Istituto nazionale di fisica nucleare (INFN), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Norges forskningsråd [Norwegian Research Council] , Ministry of Education and Science of the Russian Federation (MESRF), Spain. Ministerio de Ciencia e Innovación (MCI), Science and Technology Facilities Council (Great Britain) (STFC), European Union (EU), Alfred P. Sloan Foundation, United States-Israel Binational Science Foundation

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