Transition between nuclear and quark-gluon descriptions of hadrons and light nuclei

Abstract

We provide a perspective on studies aimed at observing the transition between hadronic and quark-gluonic descriptions of reactions involving light nuclei. We begin by summarizing the results for relatively simple reactions such as the pion form factor and the neutral pion transition form factor as well as that for the nucleon and end with exclusive photoreactions in our simplest nuclei. A particular focus will be on reactions involving the deuteron. It is noted that a firm understanding of these issues is essential for unraveling important structure information from processes such as deeply virtual Compton scattering as well as deeply virtual meson production. The connection to exotic phenomena such as color transparency will be discussed. A number of outstanding challenges will require new experiments at modern facilities on the horizon as well as further theoretical developments.

37 pages, 17 figures, submitted to Reports on Progress in Physics

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• Explanation and Prediction of Observables using Continuum Strong QCD
• The pion: an enigma within the Standard Model
• Pion distribution amplitude from lattice-QCD
• Exposing strangeness: projections for kaon electromagnetic form factors
• Flavour symmetry breaking in the kaon parton distribution amplitude
• Features and flaws of a contact interaction treatment of the kaon
• Parton distributions of light quarks and antiquarks in the proton
• Meson/Baryon/Tetraquark Supersymmetry from Superconformal Algebra and Light-Front Holography
• Nuclear physics in soft-wall AdS/QCD: Deuteron electromagnetic form factors
• Fitting N${}^3$LO pseudopotentials through central plus tensor Landau parameters
• Deuteron electromagnetic structure functions and polarization properties in soft-wall AdS/QCD
• On the deuteron relativistic charge distributions
• Nucleon axial form factor at large momentum transfers
• Deuteron transverse densities in holographic QCD
• JLab Measurement of the ${}^4$He Charge Form Factor at Large Momentum Transfers
• JLab Measurements of the 3He Form Factors at Large Momentum Transfers
• Modeling alignment enhancement for solid polarized targets
• Transverse densities and generalized parton distributions of $\rho$ meson in light front quark model
• $\Delta$-baryon axialvector and pseudoscalar form factors, and associated PCAC relations
• Determination of the Beam-Spin Asymmetry of Deuteron Photodisintegration in the Energy Region $E_{\gamma }=1.1-2.3$ GeV
• Transverse charge densities of the deuteron in soft-wall AdS/QCD
• Study of resonance states of ${}^{11}$Be with isospectral bound state microscopic potential
• DSE Perspective on QCD Modeling, Distribution Amplitudes, and Form Factors
• Asymptotic of the electric structure function and the deuteron wave function
• Images of the Origin of Mass