6533b857fe1ef96bd12b3c7e
RESEARCH PRODUCT
Properties of hyperons in chiral perturbation theory
Li-sheng GengL. Alvarez-rusoJ. Martin CamalichM. J. Vicente Vacassubject
Semileptonic decayPhysicsNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryMagnetic momentCabibbo–Kobayashi–Maskawa matrixNuclear TheoryHigh Energy Physics::PhenomenologyHyperonFOS: Physical sciencesFísicaHyperon phenomenologyRenormalizationHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Chiral perturbation theoryCovariant transformationHigh Energy Physics::ExperimentPhenomenology (particle physics)description
The development of chiral perturbation theory in hyperon phenomenology has been troubled due to power-counting subtleties and to a possible slow convergence. Furthermore, the presence of baryon-resonances, e.g. the lowest-lying decuplet, complicates the approach, and the inclusion of their effects may become necessary. Recently, we have shown that a fairly good convergence is possible using a renormalization prescription of the loop-divergencies which recovers the power counting, is covariant and consistent with analyticity. Moreover, we have systematically incorporated the decuplet resonances taking care of both power-counting and $consistency$ problems. A model-independent understanding of diferent properties including the magnetic moments of the baryon-octet, the electromagnetic structure of the decuplet resonances and the hyperon vector coupling $f_1(0)$, has been successfully achieved within this approach. We will briefly review these developments and stress the important role they play for an accurate determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$ from hyperon semileptonic decay data.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-11-17 |