0000000000109217
AUTHOR
Dan Strottman
Chiral dynamics in the gamma p ->pi(0)eta p and gamma p ->pi K-0(0)Sigma(+) reactions
Using a chiral unitary approach for meson-baryon scattering in the strangeness zero sector, where the N∗(1535) resonance is dynamically generated, we study the reactions γp→π0ηp and γp→π0K0Σ+ at photon energies at which the final states are produced close to threshold. Among several reaction mechanisms, we find the most important is the excitation of the Δ∗(1700) state which subsequently decays into a pseudoscalar meson and a baryon belonging to the Δ(1232) decuplet. Hence, the reaction provides useful information with which to test current theories of the dynamical generation of the low-lying 3/2− states. The first reaction is shown to lead to sizable cross sections and the N∗(1535) resona…
CHIRAL DYNAMICS IN THE π0η PHOTOPRODUCTION ON THE PROTON
A theoretical model for the recently measured γp → π0ηp and related reactions is presented. These reactions are an interesting testing ground for existing γN → ππN models in an extension to SU(3). The chiral unitary schemes in which the N*(1535) and Δ*(1700) appear dynamically generated predict the dominant resonance couplings in the two-meson production processes.