Determination of Vts from D -> K* l nu and B -> K* gamma data via heavy quark symmetry and perturbative QCD

Abstract

We use heavy quark effective theory (HQET) and perturbative QCD to study the heavy meson -- light vector meson transitions involved in D and B decays. HQET is used to relate the measured D -> K* l nu vector and axial-vector form factors at four-momentum transfer q^2 = 0 to the B -> K* gamma tensor and axial-tensor form factors at q^2 = 16.5 GeV^2. Perturbative QCD is then used to find matching conditions for the B-meson form factors at q^2 = 0. A five parameter ``vector dominance'' type fit of the two HQET form factors, consisting of single pole, double pole, and subtraction terms, is used to match the data at q^2 = 16.5 GeV^2 to QCD at q^2 = 0. The values at q^2 = 0 are compared with recent data on the exclusive rate for B -> K* gamma decay to extract a value for the Cabibbo-Kobayashi-Maskawa matrix element Vts = 0.035, with 28% experimental uncertainty, and 32% theoretical uncertainty from higher order QCD effects and violations of heavy quark symmetry.

arXiv comment30 pages, Preprint Univ. Florida UFIFT-93-26; 7 .eps figures; requires LaTeX, revtex, epsf.sty

References in corpus (8)

• Theoretical Uncertainties and Phenomenological Aspects of $B\to X_s\gamma$ Decay
• $b\to s\gamma$ Decay and Supersymmetry
• Can $b\to s\gamma$ Close the Supersymmetric Higgs Production Window?
• Implications of $b\to s\gamma$ decay measurements in testing the MSSM Higgs sector
• The Residual Mass Term in the Heavy Quark Effective Theory
• The Decay $B\to \pi \ell \nu$ in Heavy Quark Effective Theory
• Radiative $B\to K^{\ast }\gamma$ transition in QCD
• $B\to K^{\ast }+\gamma$ and $B_s\to \varphi +\gamma$ on the Lattice

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• Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the Lattice
• Lattice Study of the Decay B^0-bar -> rho^+ l^- nu_l-bar: Model-Independent Determination of |V_{ub}|
• Symmetry-breaking corrections to heavy meson form factor relations
• Penguins leaving the pole: bound-state effects in B decaying to K* + photon
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• Heavy Light Weak Matrix Elements
• On the broken gauge, conformal and discrete symmetries in particle physics
• 1/m_Q corrections in heavy meson decays
• Small Elements in Fermion Mass Matrices and Anomalous Dipole Moments