Determination of the form factors for the decay B{sup 0}{yields}D*{sup -}l{sup +}{nu}{sub l} and of the CKM matrix element |V{sub cb}|

Journal Article · Fri Feb 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.032002· OSTI ID:21039004

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Tico, J Garra; Grauges, E ^[2]; Lopez, L; Palano, A ^[3]; Eigen, G; Ofte, I; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D 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. Universita di Bari, Dipartimento di Fisica and INFN, 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 present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub cb}| and of the parameters {rho}{sup 2}, R{sub 1}(1), and R{sub 2}(1), which fully characterize the form factors for the B{sup 0}{yields}D*{sup -}l{sup +}{nu}{sub l} decay in the framework of heavy-quark effective field theory. The results, based on a selected sample of about 52 800 B{sup 0}{yields}D*{sup -}l{sup +}{nu}{sub l} decays, recorded by the BABAR detector, are {rho}{sup 2}=1.157{+-}0.094{+-}0.027, R{sub 1}(1)=1.327{+-}0.131{+-}0.043, R{sub 2}(1)=0.859{+-}0.077{+-}0.021, and F(1)|V{sub cb}|=(34.7{+-}0.4{+-}1.0)x10{sup -3}. The first error is the statistical and the second is the systematic uncertainty. Combining these measurements with the previous BABAR measurement of the form factors, which employs a different fit technique on a partial sample of the data, we improve the statistical precision of the result, {rho}{sup 2}=1.191{+-}0.048{+-}0.028, R{sub 1}(1)=1.429{+-}0.061{+-}0.044, R{sub 2}(1)=0.827{+-}0.038{+-}0.022, and F(1)|V{sub cb}|=(34.4{+-}0.3{+-}1.1)x10{sup -3}. Using lattice calculations for the axial form factor F(1), we extract |V{sub cb}|=(37.4{+-}0.3{+-}1.2{+-}{sub 1.4}{sup 1.2})x10{sup -3}, where the third error is due to the uncertainty in F(1). We also present a measurement of the exclusive branching fraction, B=(4.69{+-}0.04{+-}0.34)%.

• OSTI ID: 21039004
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
B QUARKS
BRANCHING RATIO
C QUARKS
D*-2010 MESONS
ELECTRON-POSITRON INTERACTIONS
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
LATTICE FIELD THEORY
MULTIPARTICLE SPECTROMETERS
NEUTRINOS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
QUANTUM CHROMODYNAMICS
T QUARKS