Jan 23 – 27, 2023
Bormio, Italy
Europe/Berlin timezone

Pion Photoproduction on the Nucleons with the Unitary Isobar Model PionMAID

Jan 27, 2023, 5:20 PM
Bormio, Italy

Bormio, Italy

Short Contribution Friday Afternoon


Victor Kashevarov (Institut für Kernphysik, Mainz)


The unitarity isobar model PionMAID is part of the Mainz MAID project with online
programs performing real-time calculations of observables, amplitudes
and partial waves (multipoles).
The model has been developed to analyze new high
precision data from A2 at MAMI, CBELSA/TAPS, GRAAL, and CLAS Collaborations
for pion photoproduction on protons and neutrons.
The background is described in a recently developed Regge cut model and
Born terms. Resonance part includes 21 nucleon and 11 delta resonances
parameterized with Breit-Wigner shapes.
A new approach is discussed to avoid double
counting in the overlap region of Regge and Resonances.
The model describes data from the pion threshold upto W = 6 GeV.

Topic Hadron Physics

Presentation materials