Study of B̅ → X_u ℓν̅ decays in BB̅ events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|

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Study of B̅ → X_u ℓν̅ decays in BB̅ events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|

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Title: Study of B̅ → X_u ℓν̅ decays in BB̅ events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Garra Tico, J.;
Grauges, E.;
Martinelli, M.;
Milanes, D. A.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2012-08-07
Format: Text
Item Type: Article
Keywords: Quarks
CP violation (Nuclear physics)
B mesons--Decay
Abstract: We report measurements of partial branching fractions for inclusive charmless semileptonic B decays B̄→X ulν̄ 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 ulν̄ decays. .
Publisher: American Physical Society
ISSN: 1550-7998
Source: Physical Review D - Particles, Fields, Gravitation and Cosmology
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.86.032004
Persistent Link: http://hdl.handle.net/10735.1/3082
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, et al. 2012. "Study of B̅ → X_u ℓν̅ decays in BB̅ events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|" Physical Review D 86(3), doi:10.1103/PhysRevD.86.032004
Terms of Use: © 2012 American Physical Society

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