D. Winney
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View article: $ϕ\to 3π$ and $ϕπ^{0}$ transition form factor from Khuri-Treiman equations
$ϕ\to 3π$ and $ϕπ^{0}$ transition form factor from Khuri-Treiman equations Open
This work studies the $ϕ\to 3π$ decay and the $ϕ\to π^0 γ^\ast$ transition form factor, utilizing the Khuri-Treiman formalism to account for analyticity, crossing, and unitarity. Using once-subtracted dispersion relations, we perform a sim…
View article: Nonperturbative aspects of the electromagnetic pion form factor at high energies
Nonperturbative aspects of the electromagnetic pion form factor at high energies Open
The structure of hadronic form factors at high energies and their deviations from perturbative quantum chromodynamics provide insight on nonperturbative dynamics. Using an approach that is consistent with dispersion relations, we construct…
View article: Studying <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> photoproduction beyond Pomeron exchange
Studying photoproduction beyond Pomeron exchange Open
Forward photoproduction of π+π− pairs with invariant mass of the order of mρ∼770 MeV is traditionally attributed to Pomeron exchange. Based on a detailed analysis of the CEBAF Large Acceptance Spectrometer photoproduction data collected a…
View article: Toward a unified description of hadron scattering at all energies
Toward a unified description of hadron scattering at all energies Open
The construction of general amplitudes satisfying symmetries and S-matrix constraints has been the primary tool in studying the spectrum of hadrons for over half a century. In this work, we present a new parametrization, which can fulfill …
View article: Revisiting gauge invariance and Reggeization of pion exchange
Revisiting gauge invariance and Reggeization of pion exchange Open
The Reggeized pion is expected to provide the main contribution to the forward cross section in light meson photoproduction reactions with charge exchange at high energies. We discuss the Reggeization of pion exchange in charged pion photo…
View article: Towards a unified description of hadron scattering at all energies
Towards a unified description of hadron scattering at all energies Open
The construction of general amplitudes satisfying symmetries and $S$-matrix constraints has been the primary tool in studying the spectrum of hadrons for over half a century. In this work, we present a new parameterization, which can fulfi…
View article: Revisiting gauge invariance and Reggeization of pion exchange
Revisiting gauge invariance and Reggeization of pion exchange Open
The Reggeized pion is expected to provide the main contribution to the forward cross section in light meson photoproduction reactions with charge exchange at high energies. We discuss the Reggeization of pion exchange in charged pion photo…
View article: Studying $π^+π^-$ photoproduction beyond Pomeron exchange
Studying $π^+π^-$ photoproduction beyond Pomeron exchange Open
Forward photoproduction of $π^+π^-$ pairs with invariant mass of the order of $m_ρ\sim 770$ MeV is traditionally understood to be produced via Pomeron exchange. Based on a detailed analysis of the CLAS photoproduction data, it is shown tha…
View article: How many vector charmoniumlike states lie in the mass range 4.2–4.35 GeV?
How many vector charmoniumlike states lie in the mass range 4.2–4.35 GeV? Open
In recent years many vector charmonium(like) states were reported by different electron-positron collider experiments above 4.2 GeV. However, so far, there not only exists sizable tension in the parameters of those states, but there is als…
View article: How many vector charmonium(-like) states sit in the energy range from $4.2$ to $4.35$ GeV?
How many vector charmonium(-like) states sit in the energy range from $4.2$ to $4.35$ GeV? Open
In recent years many vector charmonium(-like) states were reported by different electron-positron collider experiments above $4.2$ GeV. However, so far, there not only exists sizable tension in the parameters of those states, but there is …
View article: Ambiguities in partial wave analysis of two spinless meson photoproduction
Ambiguities in partial wave analysis of two spinless meson photoproduction Open
We describe the formalism to analyze the mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. We show that partial waves are uniquely defined when all accessible o…
View article: Ambiguities in Partial Wave Analysis of Two Spinless Meson Photoproduction
Ambiguities in Partial Wave Analysis of Two Spinless Meson Photoproduction Open
We describe the formalism to analyze the mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. We show that partial waves are uniquely defined when all accessible o…
View article: Dynamics in near-threshold $J/ψ$ photoproduction
Dynamics in near-threshold $J/ψ$ photoproduction Open
The study of $J/ψ$ photoproduction at low energies has consequences for the understanding of multiple aspects of nonperturbative QCD, ranging from mechanical properties of the proton, to the binding inside nuclei, and the existence of hidd…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mi>Y</mml:mi><mml:mi>Z</mml:mi></mml:math> spectroscopy at electron-hadron facilities. II. Semi-inclusive processes with pion exchange
spectroscopy at electron-hadron facilities. II. Semi-inclusive processes with pion exchange Open
Semi-inclusive processes are very promising to investigate XYZ hadrons at the next generation of electron-hadron colliders, because they generally boast higher cross sections. We extend our formalism of exclusive photoproduction to semi-in…
View article: Snowmass white paper: Need for amplitude analysis in the discovery of new hadrons
Snowmass white paper: Need for amplitude analysis in the discovery of new hadrons Open
We highlight the need for the development of comprehensive amplitude analysis methods to further our understanding of hadron spectroscopy. Reaction amplitudes constrained by first principles of $S$-matrix theory and by QCD phenomenology ar…
View article: Hadron Spectroscopy in Photoproduction
Hadron Spectroscopy in Photoproduction Open
Recent decades have seen a resurge of interest in hadron spectroscopy, driven by new, high-luminosity experiments which have identified many new hadrons, both expected and unexpected. The large number of unexpected hadrons suggest contribu…
View article: Novel approaches in Hadron Spectroscopy
Novel approaches in Hadron Spectroscopy Open
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 stat…
View article: Strong QCD from Hadron Structure Experiments
Strong QCD from Hadron Structure Experiments Open
The topical workshop Strong QCD from Hadron Structure Experiments took place at Jefferson Lab from November 6–9, 2019. Impressive progress in relating hadron structure observables to the strong QCD mechanisms has been achieved from the ab …
View article: QCD2019 Workshop Summary
QCD2019 Workshop Summary Open
The topical workshop {\it Strong QCD from Hadron Structure Experiments} took place at Jefferson Lab from Nov. 6-9, 2019. Impressive progress in relating hadron structure observables to the strong QCD mechanisms has been achieved from the {…
View article: $ω\to 3π$ and $ωπ^{0}$ transition form factor revisited
$ω\to 3π$ and $ωπ^{0}$ transition form factor revisited Open
In light of recent experimental results, we revisit the dispersive analysis of the $ω\to 3π$ decay amplitude and of the $ωπ^0$ transition form factor. Within the framework of the Khuri-Treiman equations, we show that the $ω\to 3π$ Dalitz-p…
View article: Dalitz-plot decomposition for three-body decays
Dalitz-plot decomposition for three-body decays Open
We present a general formalism to write the decay amplitude for multibody reactions with explicit separation of the rotational degrees of freedom, which are well controlled by the spin of the decay particle, and dynamic functions on the su…
View article: Double polarization observables in pentaquark photoproduction
Double polarization observables in pentaquark photoproduction Open
We investigate the properties of the hidden-charm pentaquark-like resonances first observed by the LHCb Collaboration in 2015, by measuring the polarization transfer KLL between the incident photon and the outgoing proton in the exclusive …