Measurement of the B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decay rate and |V{sub cb}|

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.051502· OSTI ID:20706079

Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, J -M; Hicheur, A; Karyotakis, Y; Lees, J P; Tisserand, V; Zghiche, A ^[1]; Palano, A; Pompili, A ^[2]; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S ^[3]; Eigen, G; Ofte, I; Stugu, B ^[4]

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1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
2. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
3. Institute of High Energy Physics, Beijing 100039 (China)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway); and others

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub cb}| based on a sample of about 53 700 B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays observed by the BABAR detector. We obtain the branching fraction averaged over l=e,{mu}, B(B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l})=(4.90{+-}0.07(stat.){sub -0.35}{sup +0.36}(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost {gamma} of the D*{sup +} in the B{sup 0} rest frame. By extrapolating d{gamma}/dw to the kinematic limit w{yields}1, we extract the product of |V{sub cb}| and the axial form factor A{sub 1}(w=1). We combine this measurement with a lattice QCD calculation of A{sub 1}(w=1) to determine |V{sub cb}|=(38.7{+-}0.3(stat.){+-}1.7(syst.){sub -1.3}{sup +1.5}(theory))x10{sup -3}.

• OSTI ID: 20706079
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B NEUTRAL MESONS
BRANCHING RATIO
D*-2010 MESONS
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
LATTICE FIELD THEORY
MULTIPARTICLE SPECTROMETERS
NEUTRINOS
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
QUANTUM CHROMODYNAMICS
RELATIVISTIC RANGE
SEMILEPTONIC DECAY