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Study of Bπν and Bρν decays and determination of |Vub|

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 72, 051102(R) – Published 14 September 2005

Abstract

We present an analysis of exclusive charmless semileptonic B-meson decays based on 83×106 BB¯ pairs recorded with the BABAR detector at the Υ(4S) resonance. Using isospin symmetry, we measure branching fractions B(B0π+ν)=(1.38±0.10±0.16±0.08)×104 and B(B0ρ+ν)=(2.14±0.21±0.48±0.28)×104, where the errors are statistical, experimental systematic, and due to form-factor shape uncertainties. We compare the measured distribution in q2, the momentum-transfer squared, with theoretical predictions for the form factors from lattice QCD and light-cone sum rules, and extract the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vub|=(3.82±0.14±0.22±0.110.52+0.88)×103 from Bπν, where the fourth error reflects the uncertainty of the form-factor normalization.

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  • Received 30 June 2005

DOI:https://doi.org/10.1103/PhysRevD.72.051102

©2005 American Physical Society

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See Also

Study of Bπlν and Bρlν decays and determination of |Vub|

P. del Amo Sanchez et al. (BABAR Collaboration)
Phys. Rev. D 83, 032007 (2011)

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Vol. 72, Iss. 5 — 1 September 2005

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