Abstract
The unitary isobar model EtaMAID has been updated with an extended list of nucleon resonances, fitted to recent and new data for differential cross sections and polarization observables. The nonresonant background is described by Regge trajectories of ω,ρ and a 1 , b 1 mesons and in addition Regge cuts, where vector and axial vector mesons are exchanged together with Pomeron and f 2 mesons.
Highlights
The isobar model EtaMAID is an online program [1] of the MAID collaboration in Mainz for calculations of observables, amplitudes and multipoles for η and η photo- and electroproduction on the nucleon
The background is described in a field-theoretical approach with Feynman diagrams for Born s- and u-channels and vector-meson t-channel exchanges
The resonance part is described with resonance excitations for individual partial waves, where in our current work partial waves up to G waves are considered
Summary
The isobar model EtaMAID is an online program [1] of the MAID collaboration in Mainz for calculations of observables, amplitudes and multipoles for η and η photo- and electroproduction on the nucleon. It was introduced in 2001 [2] and updated in 2003 [3]. The high-energy region W > 2 GeV is set up with Regge trajectories and Regge cuts and can well describe all high-energy data including polarization observables for γ, π0, γ, η and γ, η. A very good description has been obtained for all existing photoproduction data
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