Measurement of the B{sup 0}{yields}{pi}{sup -}l{sup +}{nu} and B{sup +}{yields}{eta}(')l{sup +}{nu} branching fractions, the B{sup 0}{yields}{pi}{sup -}l{sup +}{nu} and B{sup +}{yields}{eta}l{sup +}{nu} form-factor shapes, and determination of |V{sub ub}|

Journal Article · Tue Mar 01 04:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.052011· OSTI ID:21578164

Amo Sanchez, P del; Lees, J P; Poireau, V; Prencipe, E; Tisserand, V ^[1]; Garra Tico, J; Grauges, E ^[2]; Martinelli, M; Milanes, D A; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Brown, D N; Kerth, L T; Kolomensky, Yu G; Lynch, G; Osipenkov, I L ^[5]; Koch, H ^[6]

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1. Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Universite de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)
6. Ruhr Universitaet Bochum, Institut fuer Experimentalphysik 1, D-44780 Bochum (Germany)

We report the results of a study of the exclusive charmless semileptonic decays, B{sup +}{yields}{eta}(')l{sup +}{nu} and B{sup 0}{yields}{pi}{sup -}l{sup +}{nu}, undertaken with approximately 464x10{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 a loose neutrino reconstruction technique. We obtain partial branching fractions for B{sup +}{yields}{eta}l{sup +}{nu} and B{sup 0}{yields}{pi}{sup -}l{sup +}{nu} decays in three and 12 bins of q{sup 2}, respectively, from which we extract the f{sub +}(q{sup 2}) form-factor shapes and the total branching fractions B(B{sup +}{yields}{eta}l{sup +}{nu})=(0.36{+-}0.05{sub stat}{+-}0.04{sub syst})x10{sup -4} and B(B{sup 0}{yields}{pi}{sup -}l{sup +}{nu})=(1.42{+-}0.05{sub stat}{+-}0.07{sub syst})x10{sup -4}. We also measure B(B{sup +}{yields}{eta}'l{sup +}{nu})=(0.24{+-}0.08{sub stat}{+-}0.03{sub syst})x10{sup -4}. We obtain values for the magnitude of the CKM matrix element |V{sub ub}| using three different QCD calculations.

• OSTI ID: 21578164
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
LEPTONS
MASSLESS PARTICLES
MATRICES
NEUTRINOS
PARTICLE DECAY
PARTICLE PROPERTIES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SEMILEPTONIC DECAY
SHAPE
SIGNALS
WEAK PARTICLE DECAY