1997/12/22 by M. Beyer
Physics and Astronomy · #Covariant transformation #High-Energy Particle Collisions Research #Mathematical physics #Nuclear physics #Omega #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Recoil #Spectrum (functional analysis) #hep-ph
paper · pdf · doi:10.1103/physrevd.58.053001
published as Phys.Rev.D58:053001,1998 · 7 pages, 4 figures, RevTeX
arxiv created 1997/12/22 · openalex publication_date 1998/07/15 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In the framework of a relativistic covariant Bethe-Salpeter model for the quark-antiquark system we present a renewed determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|. Complementing an earlier analysis applied to the whole decay spectrum for \stackrel\ensuremath→BD*e\ensuremathν we now also employ the ``zero-recoil method'' that uses the end point of the decay spectrum (\ensuremathω=1) and is suited for heavy-to-heavy transitions. The averaged experimental value extracted from the data at zero recoil, |Vcb|F(\ensuremathω=1)=0.0343\ifmmode±\else\textpm\fi0.0015, then leads to |Vcb|=0.0360\ifmmode±\else\textpm\fi0.0016. This value is somewhat larger than the one that uses the whole decay spectrum for the model analysis. We also contrast this result to a nonrelativistic model and to recent experiments on the \stackrel\ensuremath→BDe\ensuremathν semileptonic decay.