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We use heavy quark effective theory (HQET) and perturbative QCD to study theheavy meson -- light vector meson transitions involved in D and B decays. HQETis used to relate the measured D -> K* l nu vector and axial-vector formfactors at four-momentum transfer q^2 = 0 to the B -> K* gamma tensor andaxial-tensor form factors at q^2 = 16.5 GeV^2. Perturbative QCD is then used tofind matching conditions for the B-meson form factors at q^2 = 0. A fiveparameter ``vector dominance'' type fit of the two HQET form factors,consisting of single pole, double pole, and subtraction terms, is used to matchthe data at q^2 = 16.5 GeV^2 to QCD at q^2 = 0. The values at q^2 = 0 arecompared with recent data on the exclusive rate for B -> K* gamma decay toextract a value for the Cabibbo-Kobayashi-Maskawa matrix element Vts = 0.035,with 28% experimental uncertainty, and 32% theoretical uncertainty from higherorder QCD effects and violations of heavy quark symmetry.Comment: 30 pages, Preprint Univ. Florida UFIFT-93-26; 7 .eps figures;  requires LaTeX, revtex, epsf.st

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Determination of ‖<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">V</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">t</mml:mi><mml:mi mathvariant="italic">s</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>‖ from<i>D</i>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mi …

Determination of ‖Vts‖ fromD→K