6533b870fe1ef96bd12cf260
RESEARCH PRODUCT
The lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory
Li-sheng GengM. J. Vicente VacasJ. Martin Camalichsubject
PhysicsQuantum chromodynamicsNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryNuclear TheoryHigh Energy Physics::LatticeLattice field theoryQuark modelNuclear TheoryHigh Energy Physics::PhenomenologyHigh Energy Physics - Lattice (hep-lat)FísicaFOS: Physical sciencesLattice QCDBaryonNuclear Theory (nucl-th)High Energy Physics - PhenomenologyTheoretical physicsHigh Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)Covariant transformationHigh Energy Physics::ExperimentQuantum field theoryNuclear Experimentdescription
We present an analysis of the baryon-octet and -decuplet masses using covariant SU(3)-flavor chiral perturbation theory up to next-to-leading order. Besides the description of the physical masses we address the problem of the lattice QCD extrapolation. Using the PACS-CS Collaboration data we show that a good description of the lattice points can be achieved at next-to-leading order with the covariant loop amplitudes and phenomenologically determined values for the meson-baryon couplings. Moreover, the extrapolation to the physical point up to this order is found to be better than the linear one given at leading-order by the Gell-Mann-Okubo approach. The importance that a reliable combination of lattice QCD and chiral perturbation theory may have for hadron phenomenology is emphasized with the prediction of the pion-baryon and strange-baryon sigma terms.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-10-19 |