Photoproduction of pi^0 eta on protons and the Delta(1700)D_{33} resonance

TL;DR

This study measures the cross sections of gamma p to pi^0 eta p reactions, revealing the dominance of the Delta(1700)D33 resonance and providing detailed decay and helicity amplitude ratios.

Contribution

It provides new experimental data on the reaction cross sections and resonance decay ratios, enhancing understanding of the Delta(1700)D33 resonance properties.

Findings

Reaction dominated by Delta(1700)D33 resonance

Determined decay width ratio _{\u03b7b4}/_{}

Measured helicity amplitude ratio A_{3/2}/A_{1/2}

Abstract

Total and differential cross sections for the reaction gamma p -> pi^o eta p have been measured with the Crystal Ball/TAPS detector using the tagged photon facility at the MAMI C accelerator in Mainz. In the energy range E_gamma=0.95-1.4 GeV the reaction is dominated by the excitation and sequential decay of the Delta(1700)D33 resonance. Angular distributions measured with high statistics allow us to determine the ratio of hadronic decay widths \Gamma_{\eta \Delta}/\Gamma_{\pi S11} and the ratio of the helicity amplitudes A_{3/2}/A_{1/2} for this resonance.