Measurement of the B{sup 0}{yields}{pi}{sup -}l{sup +}{nu} Form-Factor Shape and Branching Fraction, and Determination of vertical bar V{sub ub} vertical bar with a Loose Neutrino Reconstruction Technique

Journal Article · Fri Mar 02 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.091801· OSTI ID:20957695

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Grauges, E ^[2]; Palano, A ^[3]; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S ^[4]; Eigen, G; Ofte, I; Stugu, B ^[5]; Abrams, G S ^[6]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
4. Institute of High Energy Physics, Beijing 100039 (China)
5. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
6. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We report the results of a study of the exclusive charmless semileptonic decay, B{sup 0}{yields}{pi}{sup -}l{sup +}{nu}, undertaken with approximately 227x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with an innovative loose neutrino reconstruction technique. We obtain partial branching fractions in 12 bins of q{sup 2}, the momentum transfer squared, from which we extract the f{sub +}(q{sup 2}) form-factor shape and the total branching fraction B(B{sup 0}{yields}{pi}{sup -}l{sup +}{nu})=(1.46{+-}0.07{sub stat}{+-}0.08{sub syst})x10{sup -4}. Based on a recent unquenched lattice QCD calculation of the form factor in the range q{sup 2}>16 GeV{sup 2}, we find the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V{sub ub} vertical bar to be (4.1{+-}0.2{sub stat}{+-}0.2{sub syst}(+0.6/-0.4){sub FF})x10{sup -3}, where the last uncertainty is due to the normalization of the form factor.

• OSTI ID: 20957695
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B NEUTRAL MESONS
BRANCHING RATIO
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
MOMENTUM TRANSFER
NEUTRINOS
PARTICLE PRODUCTION
PIONS MINUS
QUANTUM CHROMODYNAMICS
SEMILEPTONIC DECAY