Nucleon Resonance Structure Studies Via Exclusive KY Electroproduction

Abstract

Studying the structure of excited nucleon states employing the electroproduction of exclusive reactions is an important avenue for exploring the nature of the non-perturbative strong interaction. The electrocouplings of $N^{\ast }$ states in the mass range below 1.8~GeV have been determined from analyses of CLAS $\pi N$, $\eta N$, and $\pi \pi N$ data. This work has made it clear that consistent results from independent analyses of several exclusive channels with different couplings and non-resonant backgrounds but the same $N^{\ast }$ electro-excitation amplitudes, is essential to have confidence in the extracted results. In terms of hadronic coupling, many high-lying $N^{\ast }$ states preferentially decay through the $\pi \pi N$ channel instead of $\pi N$. Data from the $KY$ channels will therefore be critical to provide an independent analysis to compare the extracted electrocouplings for the high-lying $N^{\ast }$ states against those determined from the $\pi N$ and $\pi \pi N$ channels. A program to study excited $N^{\ast }$ state structure in both non-strange and strange exclusive electroproduction channels using CLAS12 will measure differential cross sections and polarization observables to be used as input to extract the ${\gamma }_{v}N{N}^{\ast }$ electrocoupling amplitudes for the most prominent $N^{\ast }$ states in the range of invariant energy $W$ up 3~GeV in the virtually unexplored domain of momentum transfers $Q^2$ up to 12~GeV${}^2$.

arXiv comment8 pages, 5 figures. Proceedings from ECT* Workshop on Nucleon Resonances: From Photoproduction to High Photon Virtualities. Oct. 12-16, 2015. arXiv admin note: substantial text overlap with arXiv:1511.07219

References in corpus (23)

• Hard Exclusive Reactions and the Structure of Hadrons
• Explanation and Prediction of Observables using Continuum Strong QCD
• Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
• Nucleon resonances within a dynamical coupled-channels model of pi N and gamma N reactions
• Electroexcitation of nucleon resonances
• Unquenched quark propagator in Landau gauge
• Hadron Properties and Dyson-Schwinger Equations
• Completing the picture of the Roper resonance
• Dynamical Coupled-Channels Effects on Pion Photoproduction
• Analysis of full-QCD and quenched-QCD lattice propagators
• Hard exclusive electroproduction of decuplet baryons in the large N_c limit
• A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark Model
• Nucleon electromagnetic form factors and electroexcitation of low lying nucleon resonances in a light-front relativistic quark model
• First Measurement of Transferred Polarization in the Exclusive e p --> e' K+ Lambda Reaction
• Separated Structure Functions for the Exclusive Electroproduction of $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Final States
• Revealing dressed-quarks via the proton's charge distribution
• A Bayesian analysis of kaon photoproduction with the Regge-plus-resonance model
• Electroproduction of kaons from the proton in a Regge-plus-resonance approach
• Electroproduction of the $N^{\ast }(1535)$ nucleon resonance in QCD
• Studies of N^* structure from the CLAS meson electroproduction data
• Separated Structure Functions for Exclusive $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Electroproduction at 5.5 GeV with CLAS
• Induced polarization of Λ(1116) in kaon electroproduction
• Ratio of ${\sigma }_L/{\sigma }_T$ for $p(e,e^{\prime }{K}^{+})\Lambda$ Extracted from Polarization Transfer

Cited by in corpus (3)

• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• Beam-Recoil Transferred Polarization in $K^{+}Y$ Electroproduction in the Nucleon Resonance Region with CLAS12
• Excited Nucleon Spectrum and Structure Studies with CLAS and CLAS12