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Study of B̄→X ulν decays in BB events tagged by a fully reconstructed B-meson decay and determination of |V ub|
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BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F., Latham, Thomas and Puccio, E. M. T.). (2012) Study of B̄→X ulν decays in BB events tagged by a fully reconstructed B-meson decay and determination of |V ub|. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 86 (Number 3). Article number 032004. doi:10.1103/PhysRevD.86.032004
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Official URL: http://dx.doi.org/10.1103/PhysRevD.86.032004
Abstract
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays B̄→X ulν and the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V ub|. The analysis is based on a sample of 467×106 Υ(4S)→BB̄ decays recorded with the BABAR detector at the PEP-II e +e - storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions ΔB in several restricted regions of phase space and determine the CKM element |V ub| based on different QCD predictions. For decays with a charged lepton momentum pl*>1.0GeV in the B meson rest frame, we obtain ΔB=(1.80±0.13 stat±0.15 sys±0.02 theo)×10 -3 from a fit to the two-dimensional M X-q2 distribution. Here, M X refers to the invariant mass of the final state hadron X and q2 is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |V ub|=(4.33±0.24 exp±0.15 theo) ×10 -3 as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for B 0 and B - decays and derive a limit on the isospin breaking in B̄→X ulν decays.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1550-7998 | ||||
| Official Date: | 7 August 2012 | ||||
| Dates: |
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| Volume: | Volume 86 | ||||
| Number: | Number 3 | ||||
| Page Range: | Article number 032004 | ||||
| DOI: | 10.1103/PhysRevD.86.032004 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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