Measurement of the decay B →dℓνℓ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb |

Belle Collaboration

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Abstract

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| using the decay B→Dℓνℓ (ℓ=e,μ) based on 711 fb-1 of e+e-→ (4S) data recorded by the Belle detector and containing 772×106 BB¯ 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 D0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B→Dℓνℓ is found to be B(B0→D-ℓ+νℓ)=(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 ηEW|Vcb|=(40.12±1.34)×10-3, where ηEW 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 ηEW|Vcb|=(41.10±1.14)×10-3.

Original languageEnglish
Article number032006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume93
Issue number3
DOIs
Publication statusPublished - 2016 Feb 25

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decay
matrices
form factors
mesons
decay rates
leptons
quantum chromodynamics
detectors
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

@article{92c38165902e4695b33eb45484f60b76,
title = "Measurement of the decay B →dℓνℓ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb |",
abstract = "We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| using the decay B→Dℓνℓ (ℓ=e,μ) based on 711 fb-1 of e+e-→ (4S) data recorded by the Belle detector and containing 772×106 BB¯ 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 D0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B→Dℓνℓ is found to be B(B0→D-ℓ+νℓ)=(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 ηEW|Vcb|=(40.12±1.34)×10-3, where ηEW 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 ηEW|Vcb|=(41.10±1.14)×10-3.",
author = "{Belle Collaboration} and R. Glattauer and C. Schwanda and A. Abdesselam and I. Adachi and K. Adamczyk and H. Aihara and {Al Said}, S. and Asner, {D. M.} and T. Aushev and R. Ayad and T. Aziz and I. Badhrees and Bakich, {A. M.} and V. Bansal and E. Barberio and B. Bhuyan and J. Biswal and G. Bonvicini and A. Bozek and M. Bračko and F. Breibeck and Browder, {T. E.} and D. Červenkov and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and R. Chistov and K. Cho and V. Chobanova and Y. Choi and D. Cinabro and J. Dalseno and M. Danilov and N. Dash and J. Dingfelder and Z. DoleŽal and A. Drutskoy and D. Dutta and S. Eidelman and H. Farhat and Fast, {J. E.} and T. Ferber and A. Frey and Fulsom, {B. G.} and V. Gaur and N. Gabyshev and A. Garmash and R. Gillard and Eunil Won",
year = "2016",
month = "2",
day = "25",
doi = "10.1103/PhysRevD.93.032006",
language = "English",
volume = "93",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics Publising LLC",
number = "3",

}

TY - JOUR

T1 - Measurement of the decay B →dℓνℓ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb |

AU - Belle Collaboration

AU - Glattauer, R.

AU - Schwanda, C.

AU - Abdesselam, A.

AU - Adachi, I.

AU - Adamczyk, K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Ayad, R.

AU - Aziz, T.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Barberio, E.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Breibeck, F.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Chistov, R.

AU - Cho, K.

AU - Chobanova, V.

AU - Choi, Y.

AU - Cinabro, D.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, N.

AU - Dingfelder, J.

AU - DoleŽal, Z.

AU - Drutskoy, A.

AU - Dutta, D.

AU - Eidelman, S.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Frey, A.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gillard, R.

AU - Won, Eunil

PY - 2016/2/25

Y1 - 2016/2/25

N2 - We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| using the decay B→Dℓνℓ (ℓ=e,μ) based on 711 fb-1 of e+e-→ (4S) data recorded by the Belle detector and containing 772×106 BB¯ 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 D0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B→Dℓνℓ is found to be B(B0→D-ℓ+νℓ)=(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 ηEW|Vcb|=(40.12±1.34)×10-3, where ηEW 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 ηEW|Vcb|=(41.10±1.14)×10-3.

AB - We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| using the decay B→Dℓνℓ (ℓ=e,μ) based on 711 fb-1 of e+e-→ (4S) data recorded by the Belle detector and containing 772×106 BB¯ 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 D0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B→Dℓνℓ is found to be B(B0→D-ℓ+νℓ)=(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 ηEW|Vcb|=(40.12±1.34)×10-3, where ηEW 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 ηEW|Vcb|=(41.10±1.14)×10-3.

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UR - http://www.scopus.com/inward/citedby.url?scp=84960540286&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.93.032006

DO - 10.1103/PhysRevD.93.032006

M3 - Article

AN - SCOPUS:84960540286

VL - 93

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 3

M1 - 032006

ER -