Measurements of the semileptonic decays B{yields}Dl{nu} and B{yields}D*l{nu} using a global fit to DXl{nu} final states

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.012002· OSTI ID:21254667

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V ^[1]; Tico, J Garra; 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)

Semileptonic B decays to DXl{nu} (l=e or {mu}) are selected by reconstructing D{sup 0}l and D{sup +}l combinations from a sample of 230x10{sup 6} {upsilon}(4S){yields}BB decays recorded with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at SLAC. A global fit to these samples in a three-dimensional space of kinematic variables is used to determine the branching fractions B(B{sup -}{yields}D{sup 0}l{nu})=(2.34{+-}0.03{+-}0.13)% and B(B{sup -}{yields}D*{sup 0}l{nu})=(5.40{+-}0.02{+-}0.21)% where the errors are statistical and systematic, respectively. The fit also determines form-factor parameters in a parametrization based on heavy quark effective theory, resulting in {rho}{sub D}{sup 2}=1.20{+-}0.04{+-}0.07 for B{yields}Dl{nu} and {rho}{sub D*}{sup 2}=1.22{+-}0.02{+-}0.07 for B{yields}D*l{nu}. These values are used to obtain the product of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub cb}| times the form factor at the zero recoil point for both B{yields}Dl{nu} decays, G(1)|V{sub cb}|=(43.1{+-}0.8{+-}2.3)x10{sup -3}, and for B{yields}D*l{nu} decays, F(1)|V{sub cb}|=(35.9{+-}0.2{+-}1.2)x10{sup -3}.

• OSTI ID: 21254667
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
B MINUS MESONS
B QUARKS
BRANCHING RATIO
C QUARKS
D NEUTRAL MESONS
ELECTRON NEUTRINOS
ELECTRON-POSITRON COLLISIONS
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
MUON NEUTRINOS
PEP STORAGE RINGS
RECOILS
SEMILEPTONIC DECAY
STANFORD LINEAR ACCELERATOR CENTER
T QUARKS
THREE-DIMENSIONAL CALCULATIONS