The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions

TL;DR

This paper presents new polarization data for neutral pion photoproduction and performs an energy-independent partial wave analysis to extract the N(1520) 3/2- helicity amplitudes, comparing results with energy-dependent analyses.

Contribution

It provides new polarization measurements and applies an energy-independent multipole analysis, offering insights into nucleon resonance properties beyond previous energy-dependent methods.

Findings

New polarization observables T, P, and H measured

Energy-independent partial wave analysis performed

Comparison with energy-dependent analyses shows consistency

Abstract

New data on the polarization observables T, P, and H for the reaction $\gamma p \to p\pi^0$ are reported. The results are extracted from azimuthal asymmetries when a transversely polarized butanol target and a linearly polarized photon beam are used. The data were taken at the Bonn electron stretcher accelerator ELSA using the CBELSA/TAPS detector. These and earlier data are used to perform a truncated energy-independent partial wave analysis in sliced-energy bins. This energy-independent analysis is compared to the results from energy-dependent partial wave analyses.