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11 papers · 2 filters
Gauge-invariant theory of two-pion photo- and electro-production off the nucleon
Helmut Haberzettl, Kanzo Nakayama, Yongseok Oh
A field-theoretical description of the photoproduction of two pions off the nucleon is presented that applies to real as well as virtual photons in the one-photon approximation. Th…
Coupled-channel dynamics in the reactions piN --> piN, etaN, KLambda, KSigma
D. Rönchen, M. Döring, F. Huang +6
Elastic piN scattering and the world data of the family of reactions pi^- p --> eta n, K^0 Lambda$, K^0 Sigma^0, K^+ Sigma^-, and pi^+ p --> K^+ Sigma^+ are described simultaneousl…
Evaluation of the gn-->pi-p differential cross sections in the Delta-isobar region
W. J. Briscoe, A. E. Kudryavtsev, P. Pedroni +3
Differential cross sections for the process gn-->pi-p have been extracted from MAMI-B measurements of gd-->pi-pp, accounting for final-state interaction effects, using a diagrammat…
Using EFT to analyze low-energy Compton scattering from protons and light nuclei
Daniel R. Phillips, Judith A. McGovern, Harald W. Griesshammer
We discuss the application of an effective field theory (EFT) which incorporates the chiral symmetry of QCD to Compton scattering from the proton and deuteron. We describe the chir…
Compton scattering from the proton in an effective field theory with explicit Delta degrees of freedom
Judith A. McGovern, Daniel R. Phillips, Harald W. Grießhammer
We analyse the proton Compton-scattering differential cross section for photon energies up to 325 MeV using Chiral Effective Field Theory and extract new values for the electric an…
Production and parity determination of baryons
Yongseok Oh, Kanzo Nakayama, Helmut Haberzettl
To understand the structure of hadrons and their production mechanisms, it is very important to be able to identify their quantum numbers. For investigating the spin and parity qua…