BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F. and Latham, Thomas). (2012) Branching fraction and form-factor shape measurements of exclusive charmless semileptonic B decays, and determination of |Vub|. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.86 (No.9). 092004 . doi:10.1103/PhysRevD.86.092004 ISSN 1550-7998.

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Abstract

We report the results of a study of the exclusive charmless semileptonic decays, B0→π-ℓ+ν, B+→π0ℓ+ν, B+→ωℓ+ν, B+→ηℓ+ν, and B+→η′ℓ+ν (ℓ=e or μ) undertaken with approximately 462×106 BB̅ pairs collected at the Υ(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 in several bins of q2, the square of the momentum transferred to the lepton-neutrino pair, for B0→π-ℓ+ν, B+→π0ℓ+ν, B+→ωℓ+ν, and B+→ηℓ+ν. From these distributions, we extract the form-factor shapes f+(q2) and the total branching fractions B(B0→π-ℓ+ν)=(1.45±0.04stat±0.06syst)×10-4 (combined π- and π0 decay channels assuming isospin symmetry), B(B+→ωℓ+ν)=(1.19±0.16stat±0.09syst)×10-4 and B(B+→ηℓ+ν)=(0.38±0.05stat±0.05syst)×10-4. We also measure B(B+→η′ℓ+ν)=(0.24±0.08stat±0.03syst)×10-4. We obtain values for the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vub| by direct comparison with three different QCD calculations in restricted q2 ranges of B→πℓ+ν decays. From a simultaneous fit to the experimental data over the full q2 range and the FNAL/MILC lattice QCD predictions, we obtain |Vub|=(3.25±0.31)×10-3, where the error is the combined experimental and theoretical uncertainty.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	B mesons -- Decay, CP violation (Nuclear physics)
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	2012
Dates:	Date Event 2012 Published
Volume:	Vol.86
Number:	No.9
Page Range:	092004
DOI:	10.1103/PhysRevD.86.092004
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 of Canada (NSERC), France. Commissariat à l'énergie atomique (CEA), Institut national de physique nucléaire et de physique des particules, 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], Russia (Federation). Ministerstvo obrazovanii︠a︡ i nauki [Ministry of Education and Science], Spain. Ministerio de Educación y Ciencia (MEC), 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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