The QCD sum rule approach for the semileptonic decay of the D or B meson into a light meson and leptons
Journal
Z. Phys.
Journal Volume
C73
Pages
275-292
Date Issued
1997
Author(s)
Abstract
We use the method of QCD sum rules to treat the semileptonic weak decay of the D or B meson into a light meson and leptons. To obtain the transition form factors, we adopt the two-point Green's function in the presence of an external vector or axial-vector field. We find that this method can be related approximately to the traditional three-point Green's function in the heavy quark limit (mQ → ∝). Unlike some existing QCD sum rule calculations, our results indicate that the form factors have simple dipole or monopole behavior. We obtain results on the various form factors of the semileptonic decay of D and B mesons into a light meson and investigate various decay processes such as B̄0 → π+τ-v̄t and B̄0 → ρ+τ-v̄t. The method allows us to take into account nonperturbative strong interaction effects, thereby providing a more reliable determination of the Cabibbo-Kobayashi-Maskawa matrix elements from the experimental data. © Springer-Verlag 1997.
Type
journal article