Results from the N* program at JLab

Abstract

We discuss the results on the fundamental degrees of freedom underlying the nucleon excitation spectrum and how they evolve as the resonance transitions are investigated with increasingly better space-time resolution of the electromagnetic probe. The search for undiscovered but predicted states continues to be pursued with a vigorous experimental program. While recent data from JLab and elsewhere provide intriguing hints of new states, final conclusions will have to wait for the results of the broad experimental effort currently underway with CLAS, and subsequent analyses involving the EBAC at JLab.

Chapter in the book "A decade of Physics at Jefferson Lab", to be published in Journal of Physics: Conference Series

References in corpus (24)

• Electromagnetic excitation of the Delta(1232)-resonance
• Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Disentangling the dynamical origin of P11 Nucleon Resonances
• Dynamical Coupled-Channel Model of $\pi N$ Scattering in the W $\le$ 2 GeV Nucleon Resonance Region
• Perspective on rainbow-ladder truncation
• Dynamical Coupled-Channels Effects on Pion Photoproduction
• The nucleon to Delta electromagnetic transition form factors in lattice QCD
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
• Electroexcitation of the Roper resonance in the relativistic quark models
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• Dynamical coupled-channels analysis of 1H(e,e'pi)N reactions
• Model Analysis of the $ep\to e{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction Reaction on the Proton
• Extraction of Resonances from Meson-Nucleon Reactions
• Dynamical coupled-channels study of pi N --> pi pi N reactions
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Empirical transverse charge densities in the nucleon-to-P11(1440) transition
• Coupled-channels study of the ${\pi }^{-}p\to \eta n$ process
• Determination of quadrupole strengths in the gamma*p-->Delta(1232) transition at Q2= 0.20 (GeV/c)2
• Electroproduction of the N*(1535) resonance at large momentum transfer
• Large-$N_c$ relations for the electromagnetic N to Delta(1232) transition
• First Lattice Study of the $N$-$P_{11}(1440)$ Transition Form Factors
• Neutral Pion Electroproduction in the Resonance Region at High $Q^2$
• Recent results on nucleon resonance electrocouplings from the studies of ${\pi }^{+}{\pi }^{-}p$ electroproduction with the CLAS detector

Cited by in corpus (23)

• Physics Opportunities with the 12 GeV Upgrade at Jefferson Lab
• Explanation and Prediction of Observables using Continuum Strong QCD
• Progress Toward Understanding Baryon Resonances
• Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
• A study of the $P_{11}(1440)$ and $D_{13}(1520)$ resonances from CLAS data on $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$
• Nucleon and $\Delta$ elastic and transition form factors
• Spectrum of hadrons with strangeness
• New Results from the Studies of the $N(1440)1/2^{+}$, $N(1520)3/2^{-}$, and $\Delta (1620)1/2^{-}$ Resonances in Exclusive $ep\to e^{\prime }{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction with the CLAS Detector
• Masses of ground-state mesons and baryons, including those with heavy quarks
• Empirical Consequences of Emergent Mass
• Studying the P_c(4450) resonance in J/psi photoproduction off protons
• Three Lectures on Hadron Physics
• Elastic and transition form factors of the Δ(1232)
• Transition between nuclear and quark-gluon descriptions of hadrons and light nuclei
• Insights into the gamma* N -> Delta transition
• Nucleon elastic form factors at accessible large spacelike momenta
• Transition form factors: ${\gamma }^{\ast }+p\to \Delta (1232)$, $\Delta (1600)$
• Dynamical diquarks in the ${\mathbf{\gamma }}^{(\ast )}\mathbf{p}\to \mathbf{N}(1535){\frac{1}{2}}^{-}$ transition
• Studies of N^* structure from the CLAS meson electroproduction data
• ${\chi }_{c0}(1P)$ decay into $\bar{\Sigma }\Sigma \pi$ in search of an $I=1$, $1/2^{-}$ baryon state around $\bar{K}N$ threshold
• Composition of low-lying $\mathbf{J}={\frac{3}{2}}^{\pm }\mathbf{\Delta }$-baryons
• Production of negative parity baryons in the holographic Sakai-Sugimoto model
• ${\gamma }_{\mathbf{v}}\mathbf{N}{\mathbf{N}}^{\ast }$ Electrocouplings in Dyson-Schwinger Equations