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Measurement of the decay B -˃ Dl nu(l) in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cb vertical bar

Title
Measurement of the decay B -˃ Dl nu(l) in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cb vertical bar
Author
천병구
Keywords
FORM-FACTORS; MONTE-CARLO; BELLE; IDENTIFICATION; PACKAGE; PHYSICS; HEAVY; KEKB
Issue Date
2016-02
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v. 93, NO 3, Article number 032006, Page. 32006-32006
Abstract
We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cb vertical bar using the decay B -˃ Dl nu(l) (l = e,mu) based on 711 fb(-1) of e(+)e(-) -˃ Upsilon(4S) data recorded by the Belle detector and containing 772 x 10(6) B (B) over bar pairs. One B meson in the event is fully reconstructed in a hadronic decay mode, while the other, on the signal side, is partially reconstructed from a charged lepton and either a D+ or D-0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B -˃ Dl nu(l) is found to be B(B-0 -˃ D(-)l(vertical bar)nu(l)) = (2.31 +/- 0.03(stat) +/- 0.11(syst))%. Analyzing the differential decay rate as a function of the hadronic recoil with the parametrization of Caprini, Lellouch, and Neubert and using the form-factor prediction G(1) = 1.0541 +/- 0.0083 calculated by FNAL/MILC, we obtain eta(EW)vertical bar V-cb vertical bar = (40.12 +/- 1.34) x 10(-3), where eta(EW) is the electroweak correction factor. Alternatively, assuming the model-independent form-factor parametrization of Boyd, Grinstein, and Lebed and using lattice QCD data from the FNAL/MILC and HPQCD collaborations, we find eta(EW)vertical bar V-cb vertical bar = (41.10 +/- 1.14) x 10(-3).
URI
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.032006http://hdl.handle.net/20.500.11754/31843
ISSN
2470-0010; 2470-0029
DOI
10.1103/PhysRevD.93.032006
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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