6533b821fe1ef96bd127b96d
RESEARCH PRODUCT
Threshold Neutral Pion Photoproduction on the Proton
Astrid Hiller BlinManuel J. Vicente VacasTim Ledwigsubject
Scattering cross-sectionPhysicsRange (particle radiation)Particle physicsChiral perturbation theoryProton010308 nuclear & particles physicsHigh Energy Physics::LatticeFOS: Physical sciences01 natural sciencesResonance (particle physics)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Pion0103 physical sciencesConvergence (routing)Covariant transformation010306 general physicsdescription
The neutral pion photoproduction on the proton near threshold has a very small scattering cross section when compared to the charged channels, which in ChPT is explained by strong cancellations between the lowest order pieces. Therefore it is very sensitive to higher-order corrections of chiral perturbation theory. We perform a fully covariant calculation up to chiral order p^3 and we investigate the effect of the inclusion of the Delta(1232) resonance as an explicit degree of freedom. We show that the convergence improves, leading to a much better agreement with data at a wide range of energies.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-08-14 | Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015) |