Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p

Abstract

We evaluate the polarization observables I^S and I^C for the reaction gamma p --> pi^0 eta p, using a chiral unitary framework developed earlier. The I^S and I^C observables have been recently measured for the first time by the CBELSA/TAPS collaboration. The theoretical predictions of I^S and I^C, given for altogether 18 angle dependent functions, are in good agreement with the measurements. Also, the asymmetry dSigma/dcos(theta) evaluated here agrees with the data. We show the importance of the Delta(1700)D33 resonance and its S-wave decay into eta Delta(1232). The result can be considered as a further confirmation of the dynamical nature of this resonance. At the highest energies, deviations of the predictions from the data start to become noticeable, which leaves room for additional processes and resonances such as a Delta(1940)D33. We also point out how to further improve the calculation.

Version accepted for publication by the European Physical Journal A, 9 pages, 7 figures

References in corpus (9)

• Extended Partial-Wave Analysis of piN Scattering Data
• New results on the Roper resonance and the P_{11} partial wave
• A gauge invariant chiral unitary framework for kaon photo- and electroproduction on the proton
• Baryon resonances and polarization transfer in hyperon photoproduction
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton
• Clues to the nature of the Delta^*(1700) resonance from pion- and photon-induced reactions
• Radiative decay of the Delta(1700)
• Analysis of angular distributions in gamma N \to pi0 eta N

Cited by in corpus (9)

• The reaction pi+ p --> K+ Sigma+ in a unitary coupled-channels model
• Light Baryon Spectroscopy
• Hyperon II: Properties of excited hyperons
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• Polarization observables in ${\pi }^0\eta$-photoproduction on the proton
• First measurement of target and beam-target asymmetries in the $\gamma p\to {\pi }^0\eta p$ reaction
• Theoretical study of the $\gamma d\to {\pi }^0\eta d$ reaction
• Target and beam-target asymmetry measurements at MAMI