Chiral dynamics in the gamma p --> pi^0 eta p and gamma p --> pi^0 K^0 Sigma^+ reactions

Abstract

Using a chiral unitary approach for meson-baryon scattering in the strangeness zero sector, where the $N^{\ast }(1535)$ resonance is 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 ${\Delta }^{\ast }(1700)$ state which subsequently decays into a pseudoscalar meson and a baryon belonging to the $\Delta (1232)$ 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 $N^{\ast }(1535)$ resonance shape is seen clearly in the $\eta p$ invariant mass distribution. The same dynamical model is shown to lead to much smaller cross sections at low energies in the second reaction. Predictions are made for cross sections and invariant mass distributions which can be compared with forthcoming experiments at ELSA.

22 pages, 22 figures

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Cited by in corpus (61)

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• Light Baryon Spectroscopy
• Transition form factors of the N*(1535) as a dynamically generated resonance
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• A covariant model for the gamma N -> N(1535) transition at high momentum transfer
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• The $\gamma \gamma$ decay of the $f_0(1370)$ and $f_2(1270)$ resonances in the hidden gauge formalism
• Possible $\Sigma ({\frac{1}{2}}^{-})$ under the ${\Sigma }^{\ast }(1385)$ peak in $K{\Sigma }^{\ast }$ photoproduction
• Strong decays of baryons and missing resonances
• The phase and pole structure of the N*(1535) in piN-->piN and gammaN-->piN
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• Photoproduction of meson pairs: First measurement of the polarization observable I^s
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• Cross Sections and Beam Asymmetries for K+ Sigma*- photoproduction from the deuteron at 1.5-2.4 GeV
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• First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction
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• Isobar model analysis of pi0-eta photoproduction on protons
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• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• Towards the Minimal Spectrum of Excited Baryons
• Role of the $N^{\ast }(1535)$ in the ${\Lambda }_c^{+}\to {\bar{K}}^0\eta p$ decay
• Study of the $\gamma p\to {\pi }^0\eta p$ reaction with the A2 setup at MAMI
• Photoproduction ofeta-pi pairs off nucleons and deuterons
• Polarization observables in ${\pi }^0\eta$-photoproduction on the proton
• Coherent π0η photoproduction on s-shell nuclei
• Correlations of $\mathbf{\pi N}$ Partial Waves for Multi-Reaction Analyses
• Analysis of angular distributions in gamma N \to pi0 eta N
• Production of $N^{\ast }(1535)$ and $N^{\ast }(1650)$ in ${\Lambda }_c\to {\bar{K}}^0\eta p$ $(\pi N)$ decay
• Photoproduction of the $f_2^{\prime }(1525)$ and $K_2^{\ast }(1430)$
• New insights into the pole parameters of the $\Lambda (1380)$, the $\Lambda (1405)$ and the $\Sigma (1385)$
• Photoproduction of the $f_2(1270)$ resonance
• Resonance-like structure near the $\eta d$ threshold in the $\gamma d${$\to$}${\pi }^0\eta d$ reaction
• Possible ${\Sigma }^{\ast }(1/2^{-})$ in the initial-state polarized $\gamma N\to K^{+}{\Sigma }^{\ast }(1385)\to K^{+}\pi \Lambda$ reaction near threshold
• First measurement of target and beam-target asymmetries in the $\gamma p\to {\pi }^0\eta p$ reaction
• Eta Photoproduction as a Test of the Extended Chiral Symmetry
• Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory
• Study of the partial wave structure of ${\pi }^0\eta$ photoproduction on protons
• On the background in the $\gamma p\to \omega ({\pi }^0\gamma )p$ reaction and mixed event simulation
• Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV
• Partial wave expansion for photoproduction of two pseudoscalars on a nucleon
• Theory of two-pion photo- and electroproduction off the nucleon
• Theoretical study of the $\gamma d\to {\pi }^0\eta d$ reaction
• Measurement of the beam-helicity asymmetry in photoproduction of ${\pi }^0\eta$ pairs on carbon, aluminum, and lead
• The pd --> ^3He eta pi0 reaction at T_p = 1450 MeV
• Resonances in chiral unitary approaches
• Photo- and Electron-Production of Mesons on Nucleons and Nuclei
• Target and beam-target asymmetry measurements at MAMI
• Probing the isospin structure and low-lying resonances in ${\Lambda }_c^{+}\to n{\bar{K}}^0{\pi }^{+}$ decays