Meson Production and Baryon Resonances at CLAS

Abstract

I give a brief overview of the exploration of baryon properties in meson photo- and electroproduction. These processes provide ample information for the study of electromagnetic couplings of baryon resonances and to search for states, yet to be discovered. The CLAS detector, combined with the use of energy-tagged polarized photons and polarized electrons, as well as polarized targets and the measurement of recoil polarization, provide the tools for a comprehensive nucleon resonance program. I briefly present the status of this program, prospects for the next few years, and plans for the Jefferson Lab 12 GeV upgrade.

arXiv comment7 pages, 3 figures, talk presented at MESON 2010, Krakow, Poland

References in corpus (30)

• Unitary Isobar Model - MAID2007
• Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
• What is the structure of the Roper resonance?
• Baryon Current Matrix Elements in a Light-Front Framework
• Hyperon Photoproduction in the Nucleon Resonance Region
• Electromagnetic Meson Production in the Nucleon Resonance Region
• Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab
• The e p -> e' p eta reaction at and above the S11(1535) baryon resonance
• Measurement of $ep\to e^{{}^{\prime }}p{\pi }^{+}{\pi }^{-}$ and baryon resonance analysis
• Measurement of the N to Delta(1232) Transition at High Momentum Transfer by pi0 Electroproduction
• Electromagnetic transition form factors of negative parity nucleon resonances
• Q^2 Dependence of the S_{11}(1535) Photocoupling and Evidence for a P-wave resonance in eta electroproduction
• Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0
• Excited State Nucleon Spectrum with Two Flavors of Dynamical Fermions
• Electroexcitation of the Roper resonance for 1.7 < Q2 < 4.5 GeV2 in ep -> enpi+
• Single pi+ Electroproduction on the Proton in the First and Second Resonance Regions at 0.25GeV^2 < Q^2 < 0.65GeV^2 Using CLAS
• Separated Structure Functions for the Exclusive Electroproduction of $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Final States
• Cross sections and beam asymmetries for $\vev{e}p \to enπ^+$ in the nucleon resonance region for $1.7\le Q^2\le 4.5(GeV{)}^2$
• Electroexcitation of the Roper resonance in the relativistic quark models
• Model Analysis of the $ep\to e{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction Reaction on the Proton
• A consistent explanation of the Roper phenomenology
• Valence quark contributions for the gamma N -> P11(1440) form factors
• Empirical transverse charge densities in the nucleon-to-P11(1440) transition
• Extraction of P11 resonances from pi N data
• Cascade production in the reactions gamma p --> K+ K+ (X) and gamma p --> K^+ K^+ pi- (X)
• A measurement of the differential cross section for the reaction $\gamma n\to {\pi }^{-}p$ from deuterium
• Differential cross section of gamma n to K+ Sigma- on bound neutrons with incident photons from 1.1 to 3.6 GeV
• Electroproduction of p π^{+} π^{-} off protons at 0.2<Q^{2}<0.6 GeV^{2} and 1.3<W<1.57 GeV with CLAS
• First Lattice Study of the $N$-$P_{11}(1440)$ Transition Form Factors
• Dynamically Generated Resonances in the Chiral Unitary Approach to Meson Baryon Interaction

Cited by in corpus (2)

• A study of the $P_{11}(1440)$ and $D_{13}(1520)$ resonances from CLAS data on $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$
• Studying the P_c(4450) resonance in J/psi photoproduction off protons