6533b85efe1ef96bd12c0566
RESEARCH PRODUCT
Chiral dynamics in the γ→p→pπ0 reaction
M. J. Vicente VacasT. LedwigA. N. Hiller Blinsubject
Chiral anomalyPhysicsNuclear and High Energy PhysicsParticle physicsChiral perturbation theory010308 nuclear & particles physicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyNuclear TheoryDegrees of freedom (physics and chemistry)01 natural sciencesResonance (particle physics)BaryonPionQuantum electrodynamics0103 physical sciencesCovariant transformationNuclear Experiment010306 general physicsMicrotrondescription
Abstract We investigate the neutral pion photoproduction on the proton near threshold in covariant chiral perturbation theory with the explicit inclusion of Δ degrees of freedom. This channel is specially sensitive to chiral dynamics and the advent of very precise data from the Mainz microtron has shown the limits of the convergence of the chiral series for both the heavy baryon and the covariant approaches. We show that the inclusion of the Δ resonance substantially improves the convergence leading to a good agreement with data for a wider range of energies.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-07-01 | Physics Letters B |