6533b858fe1ef96bd12b5872
RESEARCH PRODUCT
Pion photoproduction off nucleons in covariant chiral perturbation theory
Astrid N. Hiller BlinDe-liang YaoGustavo H. Guerrero NavarroM. J. Vicente Vacassubject
PhysicsParticle physicsChiral perturbation theory010308 nuclear & particles physicsNuclear TheoryFOS: Physical sciencesCharge (physics)01 natural sciencesResonance (particle physics)Computer Science::Digital LibrariesBaryonHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)PionScheme (mathematics)0103 physical sciencesCovariant transformation010306 general physicsNucleondescription
Pion photoproduction off the nucleon close to threshold is studied in covariant baryon chiral perturbation theory at O($p^3$) in the extended-on-mass-shell scheme, with the explicit inclusion of the $\Delta(1232)$ resonance using the $\delta$ counting. The theory is compared to the available data of cross sections and polarization observables for all the charge channels. Most of the necessary low energy constants are well known from the analysis of other processes and the comparison with data strongly constrains some of the still unknown ones. The $\Delta(1232)$ contribution is significant in improving the agreement with data, even at the low energies considered.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-11-21 | Physical Review D |