Measurements of B{yields}({pi},{eta},{eta}{sup '})l{nu}{sub l} Branching Fractions and Determination of |V{sub ub}| with Semileptonically Tagged B Mesons

Journal Article · Fri Aug 22 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.081801· OSTI ID:21134147

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V ^[1]; Garra Tico, J; Grauges, E ^[2]; Lopez, L; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D N; Cahn, R N ^[5]

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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. 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)

We report measurements of branching fractions for the decays B{yields}Pl{nu}{sub l}, where P are the pseudoscalar charmless mesons {pi}{sup -}, {pi}{sup 0}, {eta} and {eta}{sup '}, based on 348 fb{sup -1} of data collected with the BABAR detector, using B{sup 0} and B{sup +} mesons found in the recoil of a second B meson decaying as B{yields}D{sup (*)}l{nu}{sub l}. Assuming isospin symmetry, we combine pionic branching fractions to obtain B(B{sup 0}{yields}{pi}{sup -}l{sup +}{nu}{sub l})=(1.54{+-}0.17{sub (stat)}{+-}0.09{sub (syst)})x10{sup -=} 4; we find 3.2{sigma} evidence of the decay B{sup +}{yields}{eta}l{sup +}{nu}{sub l} and measure its branching fraction to be (0.64{+-}0.20{sub (stat)}{+-}0.03{sub (syst)})x10{sup -4}, and determine B(B{sup +}{yields}{eta}{sup '}l{sup +}{nu}{sub l})<0.47x10{sup -4} to 90% confidence level. Using partial branching fractions for the pionic decays in ranges of the momentum transfer and a variety of form factor calculation, we obtain values of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub ub}| in ranging from 3.6x10{sup -3} to 4.1x10{sup -3}.

• OSTI ID: 21134147
• Journal Information: Physical Review Letters, Vol. 101, Issue 8; Other Information: DOI: 10.1103/PhysRevLett.101.081801; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). BABAR Collaboration; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B NEUTRAL MESONS
B PLUS MESONS
BRANCHING RATIO
ETA MESONS
FORM FACTORS
ISOSPIN
KOBAYASHI-MASKAWA MATRIX
MOMENTUM TRANSFER
PARTICLE DECAY
PIONS MINUS
PIONS NEUTRAL
SYMMETRY