Light Baryon Spectroscopy

Abstract

This review treats the advances in Light Baryon Spectroscopy of the last two decades, which were mainly obtained by measuring meson-production reactions at photon facilities all over the world. We provide a consistent compendium of experimental results, as well as a review of the theoretical methods of amplitude analysis used to analyze the data. The most significant datasets are presented in detail and are listed in combination with a full set of the relevant references. In addition, a brief summary of spin-formalisms, which are ubiquitous in Light Baryon Spectroscopy, as well as a review on complete experiments, are provided. The synthesis of the reviewed knowledge is presented in a full interpretation of the new results on the Light Baryon Spectrum.

arXiv comment142 pages, 52 figures, 19 tables; Version 1 has been accepted for publication in "Progress in Particle and Nuclear Physics"; Version 2 contains further detail improvements

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• Photoproduction of $\eta$ and $\eta \prime$ Mesons off Protons
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• Coupled-channel analysis of the $\omega$-meson production in $\pi N$ and $\gamma N$ reactions for c.m. energies up to 2 GeV
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• A coupled-channel analysis of $K\Lambda$ production in the nucleon resonance region
• ${\pi }^{+}$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV
• On the nature of $a_1(1420)$
• Differential cross sections for the reactions gamma p-> p eta and gamma p -> p eta-prime
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• Double pion photoproduction on nucleon and deuteron
• Photoproduction of Baryons Decaying into N pi and N eta
• Light Baryons in a Constituent Quark Model with Chiral Dynamics
• Parity doublets and chiral symmetry restoration in baryon spectrum
• The GlueX Beamline and Detector
• Eta photoproduction in a combined analysis of pion- and photon-induced reactions
• High statistics study of the reaction $\gamma p\to p{\pi }^0\eta$
• Determining pseudoscalar meson photo-production amplitudes from complete experiments
• Measurement of the reaction gamma p --> K0 Sigma+ at photon energies up to 2.6 GeV
• Measurement of the beam asymmetry in eta-photoproduction off the proton
• Quasi-free photoproduction of eta-mesons of the neutron
• eta-photoproduction in the resonance energy region
• Dynamical coupled-channel approach to hadronic and electromagnetic production of kaon-hyperon on the proton
• Two-pole structures in QCD: Facts, not fantasy!
• Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0
• Eta-meson production in the resonance energy region
• Chiral dynamics in the gamma p --> pi^0 eta p and gamma p --> pi^0 K^0 Sigma^+ reactions
• Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements
• Three-body Unitarity with Isobars Revisited
• ${\pi }^0$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
• Multichannel parametrization of πN scattering amplitudes and extraction of resonance parameters
• Polarization Observables for Two-Pion Production off the Nucleon
• Measurement of beam-recoil observables Ox, Oz and target asymmetry for the reaction gamma p -> K Lambda
• Photocouplings at the Pole from Pion Photoproduction
• Neutral pion photoproduction off protons in the energy range 0.3 GeV < E(gamma) < 3 GeV
• On light baryons and their excitations
• On photoexcitation of baryon antidecuplet
• N* and Delta* decays into N pi0 pi0
• PANDA Phase One
• High statistics study of the reaction $\gamma p\to p2{\pi }^0$
• The reaction pi+ p --> K+ Sigma+ in a unitary coupled-channels model
• Test of low-energy theorems for p(\vec{gamma},π^{0})p in the threshold region
• Kaon photoproduction in a multipole approach
• Nucleon resonances in omega photoproduction
• Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold
• Chiral multiplets versus parity doublets in highly excited baryons
• On the cross section ratio sigma_n/sigma_p in eta photoproduction
• Photoproduction of phi(1020) mesons on the proton at large momentum transfer
• Quasi-free photoproduction of eta-mesons off the deuteron
• Differential cross section and photon beam asymmetry for the gamma n -> K+ Sigma- reaction at Egamma=1.5-2.4 GeV
• Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p\to \varphi p$
• Well-established nucleon resonances revisited by double-polarization measurements
• The helicity amplitudes A${}_{1/2}$ and A${}_{3/2}$ for the D${}_{13}(1520)$ resonance obtained from the $\vec{\gamma }\vec{p}\to p{\pi }^0$ reaction}
• eta-prime photoproduction on the proton for photon energies from 1.527 to 2.227 GeV
• The energy-dependent ${\pi }^{+}{\pi }^{+}{\pi }^{+}$ scattering amplitude from QCD
• $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ photoproduction with fine center-of-mass energy resolution
• Differential cross sections and spin density matrix elements for the reaction gamma p -> p omega
• Study of the reaction $\gamma p\to p{\pi }^0\eta$
• Isospin decomposition of $\gamma N\to N^{\ast }$ transitions within a dynamical coupled-channels model
• Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton
• Dynamical coupled-channels model of $K^{-}p$ reactions (II): Extraction of ${\Lambda }^{\ast }$ and ${\Sigma }^{\ast }$ hyperon resonances
• The $\sigma$ meson in a nuclear medium through two pion photoproduction
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons
• Nucleon resonance decay by the $K^0{\Sigma }^{+}$ channel
• Photoproduction of pi^0 eta on protons and the Delta(1700)D_{33} resonance
• Contribution of higher nucleon resonances to K*Λ photoproduction
• Quasifree photoproduction of $\eta$ mesons off protons and neutrons
• Photoproduction of the $\omega$ meson off the proton near threshold
• Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton
• DRAFT: Photoproduction of the ${\rho }^0$ meson on the proton at large momentum transfer
• Combined analysis of eta' production reactions: gamma N -> eta' N, N N -> N N eta', and pi N -> eta' N
• Nucleon Form Factors in a Covariant Diquark-Quark Model
• Recent developments in bound-state calculations using the Dyson-Schwinger and Bethe-Salpeter equations
• Photoproduction of pi0-mesons off protons from the Delta(1232) region to E(gamma) = 3 GeV
• Photoproduction of eta-mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) resonance
• The role of the background in the extraction of resonance contributions from meson-baryon scattering
• Study of $\eta$ and ${\eta }^{\prime }$ photoproduction at MAMI
• First measurement of the helicity asymmetry for $\gamma p\to p{\pi }^0$ in the resonance region
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• The impact of ${\mathbf{K}}^{+}\mathbf{\Lambda }$ photoproduction on the resonance spectrum
• Photoproduction of the $\omega$ meson on the proton at large momentum transfer
• Measuring the phase of the scattering amplitude with vortex beams
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• Beam asymmetry for pi+ and pi0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV
• Relevance of complex branch points for partial wave analysis
• Measurement of pi^0 photoproduction on the proton at MAMI C
• Cross Section Measurements of Charged Pion Photoproduction in Hydrogen and Deuterium from 1.1 to 5.5 GeV
• A narrow structure in the excitation function of eta-photoproduction off the neutron
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• K^0 pi^0 Sigma^+ and K^*0 Sigma^+ photoproduction off the proton
• Accurate Test of Chiral Dynamics in the \boldmath$\vec{\gamma }p\to {\pi }^{0}p$ Reaction
• Branching Fractions for Transitions of psi(2S) to J/psi
• Nucleonic resonance excitations with linearly polarized photon in $\gamma p\to \omega p$
• Exclusive ${\pi }^0$ electroproduction at $W>2$ GeV with CLAS
• Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz
• Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018
• Observation of two new $N^{\ast }$ resonances in $\psi (3686)\to p\bar{p}{\pi }^0$
• A new $N^{\ast }(1675)$ resonance in the $\gamma N\to \eta N$ reaction
• Effective Lagrangian approach to the omega meson photoproduction near threshold
• Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI
• Partial wave analysis of the reaction gamma p -> p omega$ and the search for nucleon resonances
• Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region
• Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton
• Photon beam asymmetry $\Sigma$ for $\eta$ and ${\eta }^{\prime }$ photoproduction from the proton
• Hyperon II: Properties of excited hyperons
• Polarization observables in vector meson photoproduction
• The complete experiment for photoproduction of pseudoscalar mesons in a truncated partial wave analysis
• Radiative pi0 photoproduction on protons in the Delta+(1232) region
• Probing the quark-gluon interaction with hadrons
• Phenomenology of Relativistic $3\to 3$ Reaction Amplitudes within the Isobar Approximation
• Kaon Photoproduction and the $\Lambda$ Decay Parameter ${\alpha }_{-}$
• Strong evidence for nucleon resonances near 1900\,MeV
• Double ${\pi }^0$ Photoproduction off the Proton at Threshold
• Nucleon resonances in $\gamma p\to K^{\ast +}\Lambda$
• Photoproduction of meson pairs: First measurement of the polarization observable I^s
• First measurement of the helicity asymmetry $E$ in $\eta$ photoproduction on the proton
• ${\eta }^{\prime }$ photoproduction on the nucleons in the quark model
• Nucleon resonances in the fourth resonance region
• A measurement of the differential cross section for the reaction $\gamma n\to {\pi }^{-}p$ from deuterium
• Photoproduction of ω Mesons off the Proton
• Differential cross section of gamma n to K+ Sigma- on bound neutrons with incident photons from 1.1 to 3.6 GeV
• Evidence for the $N^{\prime }(1720)3/2^{+}$ Nucleon Resonance from Combined Studies of CLAS ${\pi }^{+}{\pi }^{-}p$ Photo- and Electroproduction Data
• Octet and Decuplet masses: a covariant three-body Faddeev calculation
• $\varphi$-meson photoproduction on Hydrogen in the neutral decay mode
• Vector mesons as dynamical resonances in the Bethe-Salpeter framework
• Photoproduction of ${\eta }^{\prime }$-mesons off the deuteron
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• First Measurement of the Polarization Observable E in the $\vec{p}(\vec{\gamma },{\pi }^{+})n$ Reaction up to 2.25 GeV
• Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV
• First results on nucleon resonance photocouplings from the $\gamma p\to {\pi }^{+}{\pi }^{-}p$ reaction
• Pole positions and residues from pion photoproduction using the Laurent+Pietarinen expansion method
• Three-body scattering: Ladders and Resonances
• Updated determination of $N^{\ast }$ resonance parameters using a unitary, multichannel formalism
• Measurement of the $\vec{\gamma }p\to K^{+}\Lambda$ Reaction at Backward Angles
• First Measurement of the $\Sigma$ Beam Asymmetry in ${\eta }^{\prime }$ Photoproduction off the Proton near Threshold
• The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions
• Amplitude analysis of gamma n --> pi- p data above 1 GeV
• Insight into the narrow structure in {\boldmath{$\eta$}}-photoproduction on the neutron from helicity dependent cross sections
• Effects of a spin-flavour dependent interaction on the baryon mass spectrum
• Measurement of the Differential and Total Cross Sections of the $\gamma d\to K^0\Lambda (p)$ Reaction within the Resonance Region
• The polarization observables T, P, and H and their impact on $\gamma p\to p{\pi }^0$ multipoles
• Measurement of the Beam Asymmetry $\Sigma$ in the Forward Direction for pi0 Photoproduction
• Effects of $\Delta (1905)5/2^{+}$ on $K^{\ast }\Sigma$ photoproduction
• The BGOOD experimental setup at ELSA
• The $\sigma$-meson: four-quark vs. two-quark components and decay width in a Bethe-Salpeter approach
• Quasi-free photoproduction of eta-mesons off 3He nuclei
• $N^{\ast }$ decays to $N\omega$ from new data on $\gamma p\to \omega p$
• Poles of Karlsruhe-Helsinki KH80 and KA84 solutions extracted by using Laurent+Pietarinen method
• The extraction of $\varphi -N$ total cross section from $d(\gamma ,p{K}^{+}{K}^{-})n$
• Information Content of Polarization Measurements
• Photoproduction of pi0-mesons off neutrons in the nucleon resonance region
• Amplitude ambiguities in pseudoscalar meson photoproduction
• Precise Measurement of Sigma Beam Asymmetry for Positive Pion Photoproduction on the Proton from 800 to 1500 Mev
• Cross Section for $\gamma n\to {\pi }^{0}n$ measured at Mainz/A2
• Measurement of the ${}^{1}H$($\vec{\gamma }$, $\vec{p}$)${\pi }^0$ reaction using a novel nucleon spin polarimeter
• Toward Complete Pion Nucleon Amplitudes
• Effects of $N(2000)5/2^{+}$, $N(2060)5/2^{-}$, $N(2120)3/2^{-}$, and $N(2190)7/2^{-}$ on $K^{\ast }\Lambda$ photoproduction
• New data on $\vec{\gamma }\vec{p}\to \eta p$ with polarized photons and protons and their implications for $N^{\ast }\to N\eta$ decays
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• Ambiguities in the partial-wave analysis of pseudoscalar-meson photoproduction
• Measurement of the helicity asymmetry $E$ in $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ photoproduction
• Beam asymmetry in near threshold omega photoproduction off the proton
• Proton-${\eta }^{\prime }$ interactions at threshold
• Differential Cross Section Measurements for $\gamma n\to {\pi }^{-}p$ Above the First Nucleon Resonance Region
• Photoproduction of Neutral Pions off Protons
• Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance
• Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons
• First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons
• Evaluation of the gn-->pi-p differential cross sections in the Delta-isobar region
• More about the light baryon spectrum
• Measurement of the beam-helicity asymmetry $I^{\odot }$ in the photoproduction of ${\pi }^0{\pi }^{\pm }$-pairs off protons and off neutrons
• Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron
• Backward-angle photoproduction of ${\pi }^0$ mesons on the proton at $E_{\gamma }$ = 1.5--2.4 GeV
• A Rosetta Stone Relating Conventions In Photo-Meson Partial Wave Analyses
• Pion-nucleon charge-exchange amplitudes above 2 GeV
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons off protons with linearly polarized photons at $E_{\gamma }=1.5-3.0$ GeV
• Exclusive photoproduction of ${\pi }^0$ up to large values of Mandelstam variables $s,t$ and $u$ with CLAS
• Study of the $\gamma p\to {\pi }^0\eta p$ reaction with the A2 setup at MAMI
• Experimental study of the $\gamma p\to K^0{\Sigma }^{+}$, $\gamma n\to K^0\Lambda$, and $\gamma n\to K^0{\Sigma }^0$ reactions at the Mainz Microtron
• Hyperon I: Partial wave amplitudes for $K^{-}p$ scattering
• $K^{+}\Lambda$ photoproduction at forward angles and low momentum transfer
• Beam asymmetry $\Sigma$ measurements on the ${\pi }^{-}$ photoproduction off neutrons
• Regge phenomenology in ${\pi }^0$ and $\eta$ photoproduction
• The incompleteness of complete pseudoscalar-meson photoproduction
• Nucleon resonances in $\gamma p\to \omega p$ reaction
• The MAID Legacy and Future
• Observation of the $p{\eta }^{\prime }$ Cusp in the New Precise Beam Asymmetry $\Sigma$ Data for $\gamma p\to p\eta$
• Double-polarization observable G in neutral-pion photoproduction off the proton
• The Positive-Parity Baryon Spectrum and the Role of Hybrid Baryons
• Determining the dominant partial wave contributions from angular distributions of single- and double-polarization observables in pseudoscalar meson photoproduction
• $N^{\ast }\to N{\eta }^{\prime }$ decays from photoproduction of ${\eta }^{\prime }$-mesons off protons
• Two-Pion production in the second resonance region in ${\pi }^{-}p$ collisions with HADES
• Spin Information from Vector-Meson Decay in Photoproduction
• Polarization observables in ${\pi }^0\eta$-photoproduction on the proton
• Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
• Generalization of the model-independent Laurent-Pietarinen single-channel pole-extraction formalism to multiple channels
• $\varphi$ photoproduction on the proton at $E_{\gamma }$ = 1.5 - 2.9 GeV
• Amplitude extraction in pseudoscalar-meson photoproduction: towards a situation of complete information
• Correlations of $\mathbf{\pi N}$ Partial Waves for Multi-Reaction Analyses
• Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E
• Coherent phi and omega meson photoproduction from deuteron and non-diffractive channels
• Measurement of the Cross Section Asymmetry of the Reaction gp-->pi0p in the Resonance Energy Region Eg = 0.5 - 1.1 GeV
• Evidence for narrow resonant structures at $W\approx 1.68$ and $W\approx 1.72$ GeV in real Compton scattering off the proton
• Study of ambiguities in ${\pi }^{-}p\to \Lambda K^0$ scattering amplitudes
• Low Energy Analyzing Powers in Pion-Proton Elastic Scattering
• Partial-Wave Analysis of $\gamma p\to K^{+}\Lambda$ using a multichannel framework
• Tensor Polarization of the phi meson Photoproduced at High t
• Backward pion-nucleon scattering
• Measurement of double polarisation asymmetries in $\omega$-photoproduction
• Backward-angle photoproduction of $\omega$ and ${\eta }^{\prime }$ mesons from protons at $E_{\gamma }=1.5-3.0$ GeV
• Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV
• Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory
• Photoproduction of {\boldmath{${\pi }^0$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region
• Model discrimination in pseudoscalar-meson photoproduction
• Comment on "Evidence for narrow resonant structures at $W\approx$ 1.68 GeV and $W\approx$ 1.72 GeV in real Compton scattering off the proton"
• Moravcsik's theorem on complete sets of polarization observables reexamined
• Pionic charge exchange on the proton from 40 to 250 MeV
• Decay properties of $N^{\ast }(1895)$
• Photon beam asymmetry $\Sigma$ in the reaction $\vec{\gamma }p\to p\omega$ for $E_{\gamma }$ = 1.152 to 1.876 GeV
• Complete experiments in pseudoscalar meson photoproduction revisited
• Photon asymmetry measurements of $\overrightarrow{\gamma }\mathrm{p}\to {\pi }^0\mathrm{p}$ for E${}_{\gamma }$=320$-$650 MeV
• Observation of a structure in the M${}_{p\eta }$ invariant mass distribution near 1700 MeV/$c^2$ in the $\gamma \mathbf{p}\to \mathbf{p}{\pi }^0\eta$ reaction
• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton
• Single-energy amplitudes for pion photoproduction in the first resonance region
• Photoproduction of pi0 omega off protons for E(gamma) < 3 GeV
• Beam-Target Helicity Asymmetry $E$ in $K^0\Lambda$ and $K^0{\Sigma }^0$ Photoproduction on the Neutron
• Complete set of observables for photoproduction of two pseudoscalars on a nucleon
• What does `rho-exchange' in piN scattering mean?
• Constraints on vector meson photoproduction spin observables
• Measurement of the Σ beam asymmetry for the ω photo-production off the proton and the neutron at GRAAL
• Polarization components in ${\pi }^0$ photoproduction at photon energies up to 5.6 GeV
• First measurement of helicity-dependent cross sections in pi0-eta photoproduction from quasi-free nucleons
• New result on phase shift analysis
• Towards a model-independent partial wave analysis for pseudoscalar meson photoproduction
• The complete experiment problem of pseudoscalar meson photoproduction in a truncated partial wave analysis
• Helicity-dependent cross sections for the photoproduction of ${\pi }^0$ pairs from nucleons
• Minimal complete sets for two pseudoscalar meson photoproduction
• Measurement of the Spin Rotation Parameter A in the Elastic Pion-proton Scattering at 1.43 GeV/c
• Photoproduction of $K^{+}{K}^{-}$ meson pairs on the proton
• Backward asymmetry measurements in the elastic pion-proton scattering at resonance energies
• Transverse Polarization of ${\Sigma }^{+}(1189)$ in Photoproduction on a Hydrogen Target in CLAS
• Effects of nucleon resonances on $\eta$ photoproduction off the neutron reexamined
• Photoproduction $\gamma p\to K^{\ast +}\Lambda$ in a Reggeized model
• Amplitude- and truncated partial-wave analyses combined: A novel, almost theory-independent single-channel method for extracting photoproduction multipoles directly from measured data
• Partial-wave analyses of $\gamma p\to \eta p$ \ and $\gamma n\to \eta n$ using a multichannel framework
• Poles, the only true resonant-state signals, are extracted from a worldwide collection of partial wave amplitudes using only one, well controlled pole-extraction method
• Partial wave expansion for photoproduction of two pseudoscalars on a nucleon
• Theory of two-pion photo- and electroproduction off the nucleon
• The ANL-Osaka Partial-Wave Amplitudes of $\pi N$ and $\gamma N$ Reactions
• A Truncated partial wave analysis of a complete experiment for photoproduction of two pseudoscalar mesons on a nucleon
• Differential Cross Section for $\gamma d\to \omega d$ using CLAS at Jefferson Lab
• Separating Signals from Non-Interfering Backgrounds using Probabilistic Event Weightings
• Is the pole content of each single-energy, single-channel partial wave analysis inherently model dependent?
• Strangeness Photoproduction at the BGO-OD experiment
• Baryon resonances and strong QCD
• Physics Opportunities with Meson Beams for EIC

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