6533b828fe1ef96bd12885a9
RESEARCH PRODUCT
Form factors for semileptonic B -> pi and D -> pi decays from the Omnes representation
J. NievesJ. M. Flynnsubject
PhysicsCoupling constantNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryUnitarityMesonHigh Energy Physics::PhenomenologyFísicaLattice QCDScattering amplitudeHigh Energy Physics - PhenomenologyAmplitudeHigh Energy Physics - LatticeD mesonHigh Energy Physics::Experimentdescription
We use the Omnes representation to obtain the q-squared dependence of the form factors f+ and f0 for semileptonic H -> pi decays from the elastic pi H -> pi H scattering amplitudes, where H denotes a B or D meson. The scattering amplitudes used satisfy elastic unitarity and are calculated from two-particle irreducible amplitudes obtained using tree-level heavy meson chiral perturbation theory (HMChPT). The q-squared dependences for the form factors agree with lattice QCD results when the HMChPT coupling constant, g, takes values smaller than 0.32, and confirm the milder dependence of f0 on q-squared found in sumrule calculations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-07-24 |