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 00:00:00 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, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevD.83.052011; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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