Chiral dynamics in "gamma p --> pi^0 eta p" and related reactions

Details Chiral dynamics in "gamma p --> pi^0 eta p" and related reactions Chiral dynamics in "gamma p --> pi^0 eta p" and related reactions

2005-10-18

arxiv.org/abs/nucl-th/0510057v1

ActaPhys.Slov.56:221-226,2006

Physics

Nuclear Physics

Nuclear Theory

Talk given at the "Eta05" conference, Cracow, 09-16-2005, 4 pages, 3 figures

Scientific paper

Using a chiral unitary approach for meson-baryon scattering in the strangeness zero sector, where the $N^*(1535)$ and $\Delta^*(1700)$ resonances are dynamically generated, we study the reactions $\gamma p \to \pi^0 \eta p$ and $\gamma p \to \pi^0 K^0 \Sigma^+$ 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 $\Delta^*(1700)$ state which subsequently decays into a pseudoscalar meson and the $N^*(1535)$. Hence, the reaction provides useful information with which to test current theories of the dynamical generation of the low-lying $1/2^-$ and $3/2^-$ states. Predictions are made for cross sections and invariant mass distributions which can be compared with forthcoming experiments at ELSA.

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