2004/12/08 by Madeleine Soyeur, Matthias F. M. Lutz
Physics and Astronomy · #Amplitude #Atomic physics #Baryon #High-Energy Particle Collisions Research #Invariant mass #Meson #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Resonance (particle physics) #Scattering #nucl-th
paper · pdf · doi:10.1016/j.ppnp.2004.12.003
published as Prog.Part.Nucl.Phys.55:165-173,2005 · 8 pages, 4 figures, Proceedings of the Int. School on Nuclear Physics, 26th Course, "Lepton scattering and the structure of hadrons and nuclei", Erice (Sicily), September 16th-24th, 2004
arxiv created 2004/12/08 · openalex publication_date 2005/03/01 · arxiv updated 2010/12/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The γp → K+ π0 Λ and γp → K+ πΣ reactions are studied in the kinematic region where the π0 Λ(1116) and πΣ(1192) pairs originate dominantly from the decay of the Σ(1385) and Λ(1405) resonances. We consider laboratory photon energies around 2 GeV, i.e. total center of mass energies above the known resonance region. We compute the t-channel kaon-exchange contribution to these reactions using K- p → π0 Λ and K- p → πΣ amplitudes calculated in the framework of a chiral coupled-channel effective field theory of meson-baryon scattering. We extract from the calculated cross section the gauge-invariant double kaon pole term. We find this term to be large and likely to drive significantly the γp → K+ π0 Λ and γp → K+ πΣ reactions in the kinematics under investigation. Accurate measurements of t-distributions for these processes, in progress or planned at ELSA and at SPring-8, are needed to confirm this expectation and assess the possibility of studying antikaon-nucleon dynamics just below threshold through these reactions.