Novel approaches in Hadron Spectroscopy

Abstract

The last two decades have witnessed the discovery of a myriad of new and unexpected hadrons. The future holds more surprises for us, thanks to new-generation experiments. Understanding the signals and determining the properties of the states requires a parallel theoretical effort. To make full use of available and forthcoming data, a careful amplitude modeling is required, together with a sound treatment of the statistical uncertainties, and a systematic survey of the model dependencies. We review the contributions made by the Joint Physics Analysis Center to the field of hadron spectroscopy.

arXiv comment98 pages, 58 figures. To appear in Progress in Particle and Nuclear Physics

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• Is the X(3872) Production Cross Section at Tevatron Compatible with a Hadron Molecule Interpretation?
• The Structure of the Proton in the LHC Precision Era
• Benchmarks for the Forward Observables at RHIC, the Tevatron-run II and the LHC
• Nucleon resonances within a dynamical coupled-channels model of pi N and gamma N reactions
• Hybrid Mesons
• Electroexcitation of nucleon resonances
• Evidence for Exotic Meson Production in the Reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c
• Mesonic low-energy constants
• First measurement of near-threshold J/$\psi$ exclusive photoproduction off the proton
• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Three particles in a finite volume
• Born-Oppenheimer Approximation for the XYZ Mesons
• Two Particle States and the $S$-matrix Elements in Multi-channel Scattering
• A method to measure the antikaon-nucleon scattering length in lattice QCD
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• The Low Energy $\pi \pi$ Amplitude to One and Two Loops
• Relating the finite-volume spectrum and the two-and-three-particle $S$ matrix for relativistic systems of identical scalar particles
• Finite Volume Corrections to the Two-Particle Decay of States with Non-Zero Momentum
• Study of $P_c(4457)$, $P_c(4440)$, and $P_c(4312)$ in a quasipotential Bethe-Salpeter equation approach
• Global parton distributions with nuclear and finite-Q^2 corrections
• Three particle quantization condition in a finite volume: 2. general formalism and the analysis of data
• Update of the ALEPH non-strange spectral functions from hadronic $\tau$ decays
• A Discussion on Triangle Singularities in the ${\Lambda }_b\to J/\psi K^{-}p$ Reaction
• Three-body Unitarity in the Finite Volume
• Interpretation of the LHCb $P_c$ States as Hadronic Molecules and Hints of a Narrow $P_c(4380)$
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces II. The strange baryon spectrum
• The K^*_0(800) scalar resonance from Roy-Steiner representations of pi K scattering
• Interactions between heavy mesons and Goldstone bosons from chiral dynamics
• Empirical Fit to Precision Inclusive Electron-Proton Cross Sections in the Resonance Region
• Algebraic Models of Hadron Structure II. Strange Baryons
• Scalar mesons in a finite volume
• Formation of hidden-charm pentaquarks in photon-nucleon collisions
• Scattering phase shifts for two particles of different mass and non-zero total momentum in lattice QCD
• Constraints on the chiral unitary $\bar{K}N$ amplitude from $\pi \Sigma K^{+}$ photoproduction data
• Performance of the ATLAS Track Reconstruction Algorithms in Dense Environments in LHC Run 2
• Three-particle quantization condition in a finite volume: 1. The role of the three-particle force
• Production of the X(3872) at the Tevatron and the LHC
• Lattice QCD and Three-particle Decays of Resonances
• Resonance properties from the finite-volume energy spectrum
• Dispersive analysis of the decay eta -> 3 pi
• Identification of a Scalar Glueball
• Quark-hadron duality in electron scattering
• Quark-Hadron Duality in Electron Scattering
• Bound state nature of the exotic Z_b states
• Study of the electromagnetic transition form-factors in η-> μ^+μ^-γand ω-> μ^+μ^-π^0 decays with NA60
• What $\pi -\pi$ Scattering Tells Us About Chiral Perturbation Theory
• Neutron/Proton Structure Function Ratio at Large x
• Anatomy of the newly observed hidden-charm pentaquark states: $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$
• Observation of a J^PC = 1-+ exotic resonance in diffractive dissociation of 190 GeV/c pi- into pi- pi- pi+
• Dispersive analysis of omega --> 3pi and phi --> 3pi decays
• Study of the lineshape of the ${\chi }_{c1}(3872)$ state
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• Two-pole structure of the $D_0^{\ast }(2400)$
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• Isoscalar $\pi \pi ,K\overline{K},\eta \eta$ scattering and the $\sigma ,f_0,f_2$ mesons from QCD
• $\eta \to 3\pi$ at Two Loops In Chiral Perturbation Theory
• The lightest hybrid meson supermultiplet in QCD
• Final State Interactions and Khuri-Treiman Equations in $\eta \to 3\pi$ decays
• Observation of $Z_c(3900{)}^0$ in $e^{+}{e}^{-}\to {\pi }^0{\pi }^{0}J/\psi$
• Scalar mesons moving in a finite volume and the role of partial wave mixing
• Is f0(1710) a glueball?
• Roy-Steiner equations for gamma gamma -> pi pi
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• Observation of exotic meson production in the reaction ${\pi }^{-}p\to {\eta }^{\prime }{\pi }^{-}p$ at 18 GeV/c
• Masses of the 70- Baryons in Large Nc QCD
• Simultaneous Monte Carlo analysis of parton densities and fragmentation functions
• Interpretation of the Narrow $J/\psi p$ Peaks in ${\Lambda }_b\to J/\psi p{K}^{-}$ Decay in the Compact Diquark Model
• Finite-volume spectrum of ${\pi }^{+}{\pi }^{+}$ and ${\pi }^{+}{\pi }^{+}{\pi }^{+}$ systems
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• Three-particle systems with resonant subprocesses in a finite volume
• The glueball spectrum of SU(3) gauge theory in 3+1 dimension
• Determination of the pole position of the lightest hybrid meson candidate
• On the nature of $a_1(1420)$
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• A new Parameterization for the Pion Vector Form Factor
• Photoproduction of Exotic Baryon Resonances
• Strange quark suppression from a simultaneous Monte Carlo analysis of parton distributions and fragmentation functions
• Dispersive analysis for $\eta \to \gamma {\gamma }^{\ast }$
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• Roy-Steiner equations for pion-nucleon scattering
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• On the Equivalence of Three-Particle Scattering Formalisms
• Decays of an exotic $1^{-+}$ hybrid meson resonance in QCD
• Amplitude analysis and the nature of the Zc(3900)
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• Remarks on the $P_c$ structures and triangle singularities
• Deciphering the mechanism of near-threshold $J/\psi$ photoproduction
• Odd and Even Partial Waves of $\eta {\pi }^{-}$ and ${\eta }^{\prime }{\pi }^{-}$ in ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ at $191\text{GeV}/c$
• Electromagnetic corrections in eta --> 3 pi decays
• Strange baryon spectroscopy in the relativistic quark model
• High statistics study of the reaction $\gamma p\to p2{\pi }^0$
• Light isovector resonances in ${\pi }^{-}p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}p$ at 190 GeV/$c$
• Quark-Model Identification of Baryon Ground and Resonant States
• Observation of a new narrow axial-vector meson $a_1(1420)$
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• A Kinematically Complete Measurement of the Proton Structure Function F2 in the Resonance Region and Evaluation of Its Moments
• Parton momentum and helicity distributions in the nucleon
• Scalar isoscalar mesons and the scalar glueball from radiative $J/\psi$ decays
• Generalized Lüscher Formula in Multi-channel Baryon-Meson Scattering
• Unitarity of the infinite-volume three-particle scattering amplitude arising from a finite-volume formalism
• A new parametrization for the scalar pion form factors
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• Lambda(1405) poles obtained from pi0-Sigma0 photoproduction data
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• Hidden-charm and bottom meson-baryon molecules coupled with five-quark states
• Three-body Final State Interaction in $\eta \to 3\pi$
• The nature of $X(3872)$ from high-multiplicity $pp$ collisions
• Resonance poles and threshold energies for hadron physical problems by a model-independent universal algorithm
• Three-body interactions from the finite-volume QCD spectrum
• Relativistic three-particle quantization condition for nondegenerate scalars
• Machine learning the deuteron
• Hidden-Beauty Charged Tetraquarks and Heavy Quark Spin Conservation
• Neural network parametrization of spectral functions from hadronic tau decays and determination of QCD vacuum condensates
• Coupled-channel approach in hadron-hadron scattering
• Multi-particle systems on the lattice and chiral extrapolations: a brief review
• Electromagnetic Corrections to the decays $\eta \to 3\pi$
• Applications of quark-hadron duality in F2 structure function
• Dispersion-theoretical analysis of the D^+ --> K^- pi^+ pi^+ Dalitz plot
• Scattering of two and three physical pions at maximal isospin from lattice QCD
• A Relativistic Quark Model for Mesons with an Instanton-Induced Interaction
• $\pi \pi \to K\bar{K}$ scattering up to 1.47 GeV with hyperbolic dispersion relations
• Resonance Production and $\pi \pi$ S-wave in ${\pi }^{-}+p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}+p_{recoil}$ at 190 GeV/c
• The decay $\eta \to 3\pi$: study of the Dalitz plot and extraction of the quark mass ratio $Q$
• Estimating the Production Rate of Loosely-bound Hadronic Molecules using Event Generators
• Light-Meson Spectroscopy with COMPASS
• Properties of Regge Trajectories
• The pion-kaon scattering amplitude constrained with forward dispersion relations up to 1.6 GeV
• Vector-meson production and vector meson dominance
• Supervised deep learning in high energy phenomenology: a mini review
• Parton-Hadron Duality: Resonances and Higher Twists
• Dispersion relations for ${\gamma }^{\ast }{\gamma }^{\ast }\to \pi \pi$: helicity amplitudes, subtractions, and anomalous thresholds
• Three-particle finite-volume formalism for ${\pi }^{+}{\pi }^{+}{K}^{+}$ and related systems
• Comparison of Pion-Kaon Scattering in SU(3) Chiral Perturbation Theory and Dispersion Relations
• Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI
• Extended chiral Khuri-Treiman formalism for $\eta \to 3\pi$ and the role of the $a_0(980)$, $f_0(980)$ resonances
• Coupled-Channel Model for $\bar{K}N$ Scattering in the Resonant Region
• An Explanation for the rho-pi Puzzle of J/psi and psi' Decays
• The impact of ${\mathbf{K}}^{+}\mathbf{\Lambda }$ photoproduction on the resonance spectrum
• Confirmation of a pi_1^0 Exotic Meson in the ηπ^0 System
• From the lineshape of the $X(3872)$ to its structure
• A partial wave analysis of the centrally produced K+K- and K0K0 systems in pp interactions at 450 GeV/c and new information on the spin of the fJ(1710)
• Dalitz plot distributions in presence of triangle singularities
• A Genetic Algorithm Analysis of N* Resonances in $p(\gamma ,K^{+})\Lambda$ Reactions
• Hadronic Regge Trajectories: Problems and Approaches
• Relevance of complex branch points for partial wave analysis
• Precision measurements of $g_1$ of the proton and the deuteron with 6 GeV electrons
• Global parameterization of $\pi \pi$ scattering up to 2 GeV
• Solving relativistic three-body integral equations in the presence of bound states
• Hidden charm pentaquarks: mass spectrum, magnetic moments, and photocouplings
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• Note on X(3872) production at hadron colliders and its molecular structure
• Next-to leading order analysis of target mass corrections to structure functions and asymmetries
• Finite-Energy Sum Rules in Eta Photoproduction off the Nucleon
• Dispersion relations for ${\eta }^{\prime }\to \eta \pi \pi$
• Three-body final state interaction in $\eta \to 3\pi$ updated
• A dispersive analysis of the pion vector form factor and ${\tau }^{-}\to K^{-}{K}_S{\nu }_{\tau }$ decay
• Connecting physical resonant amplitudes and lattice QCD
• Production of $X(3872)$ at High Multiplicity
• Approximate NNLO QCD corrections to semi-inclusive DIS
• XYZ spectroscopy at electron-hadron facilities: Exclusive processes
• The Kl3 scalar form factors in the standard model
• Precise determination of resonance pole parameters through Padé approximants
• Low-lying Lambda Baryons from the Lattice
• Phenomenology of Relativistic $3\to 3$ Reaction Amplitudes within the Isobar Approximation
• Padé Approximants and Resonance Poles
• Dispersive $\pi K\to \pi K$ and $\pi \pi \to K\bar{K}$ amplitudes from scattering data, threshold parameters and the lightest strange resonance $\kappa$ or $K_0^{\ast }(700)$
• Two-loop analysis of the pion-mass dependence of the $\rho$ meson
• Consistent Dalitz plot analysis of Cabibbo-favored $D^{+}\to \bar{K}\pi {\pi }^{+}$ decays
• Identification of non-ordinary mesons from the dispersive connection between their poles and their Regge trajectories: the f0(500) resonance
• Dalitz-plot decomposition for three-body decays
• Study of the $\eta \pi$ and ${\eta }^{\prime }\pi$ spectra and interpetation of possible exotic $J^{PC}=1^{-+}$ mesons
• Evidence for the $N^{\prime }(1720)3/2^{+}$ Nucleon Resonance from Combined Studies of CLAS ${\pi }^{+}{\pi }^{-}p$ Photo- and Electroproduction Data
• Searching for the rules that govern hadron construction
• Pole position of the $a_1(1260)$ from $\tau$-decay
• Model Selection for Pion Photoproduction
• Double Polarization Observables in Pentaquark Photoproduction
• Triangle Singularity as the Origin of the $a_1(1420)$
• The string-junction picture of multiquark states: an update
• Baryonic mass formula in large $N_c$ QCD versus quark model
• Tetraquarks in large-$N_c$ QCD
• Dispersive Approach to Chiral Perturbation Theory
• Where is the lightest charmed scalar meson?
• Pole positions and residues from pion photoproduction using the Laurent+Pietarinen expansion method
• A MASTER FORMULA FOR CHIRAL SYMMETRY BREAKING
• Three-body dynamics of the $a_1(1260)$ resonance from lattice QCD
• Evidence for $Z_c^{\pm }(3900)$ in semi-inclusive decays of $b$-flavored hadrons
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• More loosely bound hadron molecules at CDF?
• Three-body scattering: Ladders and Resonances
• Determination of the lightest strange resonance $K_0^{\ast }(700)$ or $\kappa$, from a dispersive data analysis
• The Hydrogen Bond of QCD
• Experimental evidence for a vector-like behaviour of Pomeron exchange
• Central exclusive diffractive production of $K^{+}{K}^{-}{K}^{+}{K}^{-}$ via the intermediate $\varphi \varphi$ state in proton-proton collisions
• eta(1405) in a chiral approach based on mixing of the pseudoscalar glueball with the first radial excitations of eta and eta'
• Poles of Karlsruhe-Helsinki KH80 and KA84 solutions extracted by using Laurent+Pietarinen method
• Reactions with pions and vector mesons in the sector of odd intrinsic parity
• Small t elastic scattering and the rho parameter
• Small- and large-x nucleon spin structure from a global QCD analysis of polarized Parton Distribution Functions
• $Z_c(3900)$: Confronting theory and lattice simulations
• Properties of Nucleon Resonances by means of a Genetic Algorithm
• Quark-mass dependence in $\omega \to 3\pi$ decays
• Constraints on the $\omega \pi$ form factor from analyticity and unitarity
• Statistical Models with Uncertain Error Parameters
• Vector Meson Photoproduction with a Linearly Polarized Beam
• Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q^2
• Light- and strange-quark mass dependence of the $\rho (770)$ meson revisited
• Understanding the Nature of $\Lambda (1405)$ through Regge Physics
• Truncated moments of parton distributions
• Constraints on a possible dineutron state from pionless EFT
• Model independent analysis of coupled-channel scattering: a deep learning approach
• Solving integral equations in $\eta \to 3\pi$
• Beam Asymmetry $\mathbf{\Sigma }$ for the Photoproduction of $\eta$ and ${\eta }^{\prime }$ Mesons at ${\mathbf{E}}_{\gamma }=8.8$GeV
• What can we learn about light-meson interactions at electron-positron colliders?
• Classifying Pole of Amplitude Using Deep Neural Network
• $SU(3)$ Classification of $p$-Wave $\eta \pi$ and ${\eta }^{\prime }\pi$ Systems
• Comment on `Note on X(3872) production at hadron colliders and its molecular structure'
• Dalitz Plot Analysis of the Decay $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$
• Quark-hadron duality and truncated moments of nucleon structure functions
• The exotic meson ${\pi }_1(1600)$ with $J^{PC}=1^{-+}$ and its decay into $\rho (770)\pi$
• Evolution of truncated moments of singlet parton distributions
• How to employ ${\bar{B}}_d^0\to J/\psi (\pi \eta ,\bar{K}K)$ decays to extract information on $\pi \eta$ scattering
• Deep Learning Exotic Hadrons
• Evidence for $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ produced in single-tag two-photon interactions
• Exclusive photoproduction of ${\pi }^0$ up to large values of Mandelstam variables $s,t$ and $u$ with CLAS
• A New Approach to the 3D Faddeev Equation for Three-Body Scattering
• Evolution equations for truncated moments of the parton distributions
• Solving the Altarelli-Parisi equations with truncated moments
• Measurement of the $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ Dalitz plot distribution
• Chiral extrapolation and determination of low-energy constants from lattice data
• Pole structure from energy-dependent and single-energy fits to $\pi N$ elastic scattering data
• Exclusive tensor meson photoproduction
• Precision measurement of the branching fractions of J/psi -> pi+pi-pi0 and psi' -> pi+pi-pi0
• $Z_c(4430)$ and $Z_c(4200)$ as triangle singularities
• On the scalar $\pi K$ form factor beyond the elastic region
• Fermion Confinement by a Relativistic Flux Tube
• Central exclusive diffractive production of axial-vector $f_1(1285)$ and $f_1(1420)$ mesons in proton-proton collisions
• Flavor structure of $\Lambda$ baryons from lattice QCD: From strange to charm quarks
• Khuri-Treiman equations for $3\pi$ decays of particles with spin
• New analysis of $\eta \pi$ tensor resonances measured at the COMPASS experiment
• The non-ordinary Regge behavior of the K*0(800) or Kappa-meson versus the ordinary K*0(1430)
• A new approach to semi-inclusive deep-inelastic scattering with QED and QCD factorization
• Bound states in the B-matrix formalism for the three-body scattering
• What does kinematical target mass sensitivity in DIS reveal about hadron structure?
• Features of $\pi \Delta$ Photoproduction at High Energies
• High-statistics measurement of the eta->3pi^0 decay at the Mainz Microtron
• Machine learning techniques in searches for $t\bar{t}h$ in the $h\to b\bar{b}$ decay channel
• Dynamical Analysis of Screening in Scalar-Tensor Theory
• On the Spin of the X(3872)
• Dispersive calculation of complex Regge trajectories for the lightest $f_2$ resonances
• Computational challenges for MC event generation
• Semi-inclusive lepto-production of hidden-charm exotic hadrons
• Global analysis of charge exchange meson production at high energies
• On the $\eta$ and ${\eta }^{\prime }$ Photoproduction Beam Asymmetry at High Energies
• MCNNTUNES: tuning Shower Monte Carlo generators with machine learning
• Structure of Pion Photoproduction Amplitudes
• First measurement of direct photoproduction of the $a_2(1320{)}^0$ meson on the proton
• ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ in the double-Regge region
• The negative-parity spin-1/2 $\Lambda$ baryon spectrum from lattice QCD and effective theory
• What is the right formalism to search for resonances? II. The pentaquark chain
• Regge phenomenology of the $N^{\ast }$ and ${\Delta }^{\ast }$ poles
• Measurement of beam asymmetry for ${\pi }^{-}{\Delta }^{++}$ photoproduction on the proton at $E_{\gamma }$=8.5 GeV
• Analysis of DIS structure functions of the nucleon within truncated Mellin moments approach
• Photoproduction of the $f_2(1270)$ meson using the CLAS detector
• Two-gluon production of $\varphi$ and ${\eta }^{\prime }$ mesons in proton-proton collisions at high energies
• Evaluation of the inclusive electron scattering observables in the resonance region from the experimental data

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• An updated review of the new hadron states
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• Physics-Driven Learning for Inverse Problems in Quantum Chromodynamics
• A combined analysis of the $Z_c(3900)$ and the $Z_{cs}(3985)$ exotic states
• $S$- and $P$-wave fully-strange tetraquark states from QCD sum rules
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• Precise determination of the pole position of the exotic $Z_c(3900)$
• Study for a model-independent pole determination of overlapping resonances
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• XYZ spectroscopy at electron-hadron facilities II: Semi-inclusive processes with pion exchange
• Hadronic molecular states with the quark contents $bc\bar{s}\bar{q}$, $b\bar{c}s\bar{q}$, and $b\bar{c}\bar{s}q$
• Interpretation of near-threshold peaks using the method of independent S-matrix poles
• Khuri-Treiman analysis of $J/\psi \to {\pi }^{+}{\pi }^{-}{\pi }^0$
• Analytical dispersive parameterization for elastic scattering of spinless particles
• XYZ spectroscopy at electron-hadron facilities III: Semi-inclusive processes with vector exchanges
• Doubly-charmed pentaquark states in a mass splitting model
• $Z_c(3900)$ in a hadronic molecule and a triangle singularity approach at finite temperature
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• Phenomenological description of the ${\pi }^{-}{\pi }^{+}$ $S$-waves in $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ and $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decays: The problem of phases
• Dalitz-plot decomposition for the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ and $e^{+}{e}^{-}\to h_c\pi \pi$ processes
• Exotic hadrons associated with $b$-quark