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Extraction of form Factors from a Four-Dimensional Angular Analysis of B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}.

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Author information

Affiliations

  • 1. Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
      Authors
    • Lees JP 1
    • Poireau V 1
    • Tisserand V 1
    (3 authors)
  • 2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain.
      Authors
    • Grauges E 2
    (1 author)
  • 3. INFN Sezione di Bari and Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy.
      Authors
    • Palano A 3
    (1 author)
  • 4. University of Bergen, Institute of Physics, N-5007 Bergen, Norway.
      Authors
    • Eigen G 4
    (1 author)
  • 5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA.
      Authors
    • Brown DN 5
    • Kolomensky YG 5
    (2 authors)
    • Show all (69)

ORCIDs linked to this article

Show all (31)

Physical Review Letters, 01 Aug 2019, 123(9):091801
https://doi.org/10.1103/physrevlett.123.091801 PMID: 31524470 

Abstract 

An angular analysis of the decay B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}, ℓ∈{e,μ}, is reported using the full e^{+}e^{-} collision data set collected by the BABAR experiment at the ϒ(4S) resonance. One B meson from the ϒ(4S)→BB[over ¯] decay is fully reconstructed in a hadronic decay mode, which constrains the kinematics and provides a determination of the neutrino momentum vector. The kinematics of the semileptonic decay is described by the dilepton mass squared, q^{2}, and three angles. The first unbinned fit to the full four-dimensional decay rate in the standard model is performed in the so-called Boyd-Grinstein-Lebed approach, which employs a generic q^{2} parametrization of the underlying form factors based on crossing symmetry, analyticity, and QCD dispersion relations for the amplitudes. A fit using the more model-dependent Caprini-Lellouch-Neubert (CLN) approach is performed as well. Our form factor shapes show deviations from previous fits based on the CLN parametrization. The latest form factors also provide an updated prediction for the branching fraction ratio R(D^{*})≡B(B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ})=0.253±0.005. Finally, using the well-measured branching fraction for the B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ} decay, a value of |V_{cb}|=(38.36±0.90)×10^{-3} is obtained that is consistent with the current world average for exclusive B[over ¯]→D^{(*)}ℓ^{-}ν[over ¯]_{ℓ} decays and remains in tension with the determination from inclusive semileptonic B decays to final states with charm.

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Read article at publisher's site: https://doi.org/10.1103/physrevlett.123.091801

Read article for free, from open access legal sources, via Unpaywall: http://link.aps.org/pdf/10.1103/PhysRevLett.123.091801Unpaywall

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    Funding 

    Funders who supported this work.

    Alfred P. Sloan Foundation

      Bundesministerium für Bildung und Forschung

        Centre National de la Recherche Scientifique

          Commissariat à l’Énergie Atomique et aux Énergies Alternatives

            Deutsche Forschungsgemeinschaft

              IN2P3

                Instituto Nazionale di Fisica Nucleare

                  MES

                    Ministerio de Economía y Competitividad

                      National Science Foundation

                        Natural Sciences and Engineering Research Council of Canada

                          Science and Technology Facilities Council (3)

                          Stichting voor Fundamenteel Onderzoek der Materie

                            U.S. Department of Energy

                              United States - Israel Binational Science Foundation