The Impact of New Polarization Data from Bonn, Mainz and Jefferson Laboratory on γp → πN Multipoles

2016/04/19 by Arie Beck, Beck, A. V. Anisovich R., M. Döring +31
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1604.05704

openalex publication_date 2016/04/19 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

New data on pion-photoproduction off the proton have been included in the partial wave analyses Bonn-Gatchina and SAID and in the dynamical coupled-channel approach Jülich-Bonn. All reproduce the recent new data well: the double polarization data for E, G, H, P and T in γp → π⁰ p from ELSA, the beam asymmetry Σ for γp → π⁰ p and π⁺ n from Jefferson Laboratory, and the precise new differential cross section and beam asymmetry data Σ for γp → π⁰ p from MAMI. The new fit results for the multipoles are compared with predictions not taking into account the new data. The mutual agreement is improved considerably but still far from being perfect.

Related

• Polarization observables in double neutral pion photoproduction
• Measurement of single- and double-polarization observables in the photoproduction of π⁺π^-~meson pairs off the proton using CLAS at Jefferson Laboratory
• Polarization Observables T and F in the γp → π⁰ p Reaction at CLAS
• Constraining the (gamma,pi) amplitude for E2 N->delta
• Pion Polarizabilities