Unitary Isobar Model - MAID2007

Abstract

The unitary isobar model MAID2007 has been developed to analyze the world data of pion photo- and electroproduction. The model contains both a common background and several resonance terms. The background is unitarized according to the K-matrix prescription, and the 13 four-star resonances with masses below 2 GeV are described by appropriately unitarized Breit-Wigner forms. The data have been analyzed by both single-energy and global fits, and the transverse and longitudinal helicity amplitudes have been extracted for the four-star resonances below 2 GeV. Because of its inherent simplicity, MAID2007 is well adopted for predictions and analysis of the observables in pion photo- and electroproduction.

32 pages including 13 tables and 24 figures

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• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
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• Analysis of Pion Photoproduction Data
• Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions
• Electroproduction of the Delta Resonance at High Momentum Transfer
• Updated resonance photo-decay amplitudes to 2 GeV
• First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV
• Pion cloud and the $Q^2-$dependence of ${\gamma }^{\ast }N\leftrightarrow \Delta$ transition form factors
• Photo- and Electroproduction of Eta Mesons
• gamma* N -> Delta transition form factors: a new analysis of the JLab data on p(e,e'p)pi0 at Q^2=2.8 and 4.0 (GeV/c)^2
• Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)
• Measurement of the N to Delta(1232) Transition at High Momentum Transfer by pi0 Electroproduction
• Measurement of the recoil polarization in the p (\vec e, e' \vec p) pi^0 reaction at the Δ(1232) resonance
• Multipole Amplitudes of Pion Photoproduction on Nucleons up to 2GeV within Dispersion Relations and Unitary Isobar Model
• ${\pi }^0$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
• Electroexcitation of the P33(1232), P11(1440), D13(1520), S11(1535) at Q^2=0.4 and 0.65(GeV/c)^2
• Neutral pion photoproduction off protons in the energy range 0.3 GeV < E(gamma) < 3 GeV
• Electromagnetic Nucleon-to-Delta Transition in Chiral Effective-Field Theory
• Test of low-energy theorems for p(\vec{gamma},π^{0})p in the threshold region
• Pi0 photo- and electroproduction at threshold within a dynamical model
• Single pi+ Electroproduction on the Proton in the First and Second Resonance Regions at 0.25GeV^2 < Q^2 < 0.65GeV^2 Using CLAS
• Recoil Polarization for Delta Excitation in Pion Electroproduction
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }p){\pi }^o$ in the $\Delta (1232)$ Resonance Region
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• The position and the residues of the delta resonance pole in pion photoproduction
• Electromagnetic N->Delta transition and neutron form factors
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }{\pi }^{+})n$ in the $\Delta (1232)$ Resonance Region
• Chiral symmetry and the Delta-Nucleon transition form factors
• Measurement of the LT-asymmetry in π^0 electroproduction at the energy of the Δ(1232) resonance
• Excitation of S11 resonances in pion scattering and pion photoproduction on the proton
• Backward electroproduction of pi0 mesons on protons in the region of nucleon resonances at four momentum transfer squared Q**2 = 1.0 GeV**2
• Precise Measurement of Sigma Beam Asymmetry for Positive Pion Photoproduction on the Proton from 800 to 1500 Mev
• Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance
• Dispersion relation analysis of neutral pion photo- and electroproduction at threshold using the MAID and SAID solutions
• Overview of Dynamic Models for gamma N -> Delta

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