The Determination of $|\Vcb|$ and QCD Sum Rules in Hqet

Details The Determination of $|\Vcb|$ and QCD Sum Rules in Hqet The Determination of $|\Vcb|$ and QCD Sum Rules in Hqet

1993-10-27

arxiv.org/abs/hep-ph/9310356v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

18pages, PHYZZX format (uses tables & epsf, figures included), WIS-93/103/Oct-PH, Invited talk at the Advanced Study Conferenc

Scientific paper

I review recent developments in Heavy Quark Effective Theory (HQET) that lead to an almost model--independent determination of the $|\Vcb|$ element of the Cabibbo--Kobayashi--Maskawa matrix from exclusive semileptonic $B\ra D^{(*)}$ decays. In particular, I compare the theoretical uncertainties in the $B\ra D^*\ell\,\bar\nu$ and the $B\ra D\,\ell\,\bar\nu$ decay modes. I discuss the applications of QCD sum rules within HQET to semileptonic heavy meson decays and give predictions for the form factors measurable in $B\ra D^{(*)}\ell\,\bar\nu$ decays.

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