0000000000086440

AUTHOR

A. Gómez Nicola

showing 2 related works from this author

Improved unitarized Heavy Baryon Chiral Perturbation Theory for π N scattering

2000

We show how the unitarized description of pion nucleon scattering within Heavy Baryon Chiral Perturbation Theory can be considerably improved, by a suitable reordering of the expansion over the nucleon mass. Within this framework, the $\Delta$ resonance and its associated pole can be recovered from the chiral parameters obtained from low-energy determinations. In addition, we can obtain a good description of the six $S$ and $P$ wave phase shifts in terms of chiral parameters with a natural size and compatible with the Resonance Saturation Hypothesis.

PhysicsNuclear and High Energy PhysicsParticle physicsFísica-Modelos matemáticosHeavy baryon chiral perturbation theoryScatteringHigh Energy Physics::LatticeNuclear TheoryHigh Energy Physics::PhenomenologyFísicaResonance (particle physics)High Energy Physics - PhenomenologyPionPiFísica matemáticaNucleonSaturation (chemistry)Nuclear ExperimentComputer Science::Databases
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Improved unitarized heavy baryon chiral perturbation theory for πN scattering to fourth order

2004

We extend our previous analysis of the unitarized pion-nucleon scattering amplitude including up to fourth order terms in heavy baryon chiral perturbation theory. We pay special attention to the stability of the generated Delta(1232) resonance, the convergence problems, and the power counting of the chiral parameters.

PhysicsChiral anomalyNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryFísica-Modelos matemáticosUnitarityHeavy baryon chiral perturbation theoryScatteringPartial wave analysisHigh Energy Physics::LatticeNuclear TheoryHigh Energy Physics::PhenomenologyFísicaResonance (particle physics)Scattering amplitudeQuantum electrodynamicsFísica matemáticaNuclear Experiment
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