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Title: 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

Abstract

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.

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]; ; ; ; ;  [4]; ; ;  [5];  [6]
  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) (and others)
Publication Date:
OSTI Identifier:
20957695
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevLett.98.091801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., and Abrams, G. S. 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. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.091801.
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., & Abrams, G. S. 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. United States. doi:10.1103/PHYSREVLETT.98.091801.
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., and Abrams, G. S. Fri . "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". United States. doi:10.1103/PHYSREVLETT.98.091801.
@article{osti_20957695,
title = {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},
author = {Aubert, B. and Bona, M. and Boutigny, D. and Karyotakis, Y. and Lees, J. P. and Poireau, V. and Prudent, X. and Tisserand, V. and Zghiche, A. and Grauges, E. and Palano, A. and Chen, J. C. and Qi, N. D. and Rong, G. and Wang, P. and Zhu, Y. S. and Eigen, G. and Ofte, I. and Stugu, B. and Abrams, G. S.},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.98.091801},
journal = {Physical Review Letters},
number = 9,
volume = 98,
place = {United States},
year = {Fri Mar 02 00:00:00 EST 2007},
month = {Fri Mar 02 00:00:00 EST 2007}
}