Measurement of $ep\to e^{{}^{\prime }}p{\pi }^{+}{\pi }^{-}$ and baryon resonance analysis

Abstract

The cross section for the reaction $ep\to e^{\prime }p{\pi }^{+}{\pi }^{-}$ was measured in the resonance region for 1.4$<$W$<$2.1 GeV and 0.5$<Q^2<$1.5 GeV${}^2$/c${}^2$ using the CLAS detector at Jefferson Laboratory. The data shows resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on $N^{\ast }$ and $\Delta$ states shows an evident discrepancy. A better description of the data is obtained either by a sizeable change of the properties of the $P_{13}$(1720) resonance or by introducing a new baryon state, not reported in published analyses.

Paper on CLAS experiment submitted to PRL

References in corpus (4)

• Baryon Resonance Extraction from piN Data using a Unitary Multichannel Model
• Addendum to "A Phenomenological Description of pi- Delta++ photoproduction and electroproduction in nucleon resonance region"
• A Phenomenological Description of (π^{-}Δ^{++}) Photo- and Electroproduction in Nucleon Resonance Region
• Probing the Structure of Nucleons in the Resonance Region with CLAS at Jefferson Lab

Cited by in corpus (69)

• Baryon spectroscopy
• Progress Toward Understanding Baryon Resonances
• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
• Electroexcitation of nucleon resonances
• Electromagnetic Meson Production in the Nucleon Resonance Region
• Three-body Unitarity in the Finite Volume
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• A study of the $P_{11}(1440)$ and $D_{13}(1520)$ resonances from CLAS data on $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$
• Spectrum of light- and heavy-baryons
• Q^2 Dependence of the S_{11}(1535) Photocoupling and Evidence for a P-wave resonance in eta electroproduction
• 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
• N* and Delta* decays into N pi0 pi0
• Phenomenological analysis of the double pion production in nucleon-nucleon collisions up to 2.2 GeV
• Electroexcitation of nucleon resonances at Q^2=0.65 GeV/c^2 from a combined analysis of single- and double-pion electroproduction data
• Three Lectures on Hadron Physics
• Observation of Two New N* Peaks in J/psi -> $pp{i}^{-}\bar{n}$ and $\bar{p}{\pi }^{+}n$ Decays
• Cross sections and beam asymmetries for $\vev{e}p \to enπ^+$ in the nucleon resonance region for $1.7\le Q^2\le 4.5(GeV{)}^2$
• Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton
• Model Analysis of the $ep\to e{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction Reaction on the Proton
• Exclusive ${\rho }^0$ electroproduction on the proton at CLAS
• Understanding the nucleon as a Borromean bound-state
• Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial wave analysis
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer
• Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region
• Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton
• Strong decays of baryons and missing resonances
• Evidence for the $N^{\prime }(1720)3/2^{+}$ Nucleon Resonance from Combined Studies of CLAS ${\pi }^{+}{\pi }^{-}p$ Photo- and Electroproduction Data
• Measurements of $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$ Cross Sections with CLAS at $1.40<W<2.0$ GeV and $2.0<Q^2<5.0$ GeV${}^2$
• 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
• Impact Representation of Generalized Distribution Amplitudes
• First results on nucleon resonance photocouplings from the $\gamma p\to {\pi }^{+}{\pi }^{-}p$ reaction
• Electromagnetic Transition Form Factors of Baryon Resonances
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• Results from the N* program at JLab
• Lepton-Nucleus Cross Section Measurements for DUNE with the LDMX Detector
• Screened potential and the baryon spectrum
• Measurement of the beam-helicity asymmetry $I^{\odot }$ in the photoproduction of ${\pi }^0$-pairs off the proton and off the neutron
• Relativistic quark-diquark model of baryons with a spin-isospin transition interaction
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• First measurement of target and double spin asymmetries for polarized e- polarized p --> e p pi0 in the nucleon resonance region above the Delta(1232)
• N* Structure and Strong QCD
• Measurement of the beam-helicity asymmetry $I^{\odot }$ in the photoproduction of ${\pi }^0{\pi }^{\pm }$-pairs off protons and off neutrons
• Recent results on the nucleon resonance spectrum and structure from the CLAS detector
• Study of nucleon resonances with electromagnetic interactions
• Measurements of the ${\gamma }_{v}p\to p^{\prime }{\pi }^{+}{\pi }^{-}$ cross section with the CLAS detector for $0.4$ GeV${}^2$ $<Q^2<$ $1.0$ GeV${}^2$ and $1.3$ GeV $<W<$ $1.825$ GeV
• Exclusive ${\mathbf{\pi }}^0\mathbf{p}$ electroproduction off protons in the resonance region at photon virtualities 0.4~GeV${}^2$ $\le {\mathbf{Q}}^2\le 1$~GeV${}^2$
• Hard Exclusive Electroproduction of ${\pi }^{+}{\pi }^{-}$ Pairs
• First observation of $\psi (2S)\to p\bar{n}{\pi }^{-}+c.c.$
• Baryons and the Borromeo
• Q^2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model
• Combined analysis of the ${\pi }^{-}p\to K^0\Lambda$, $\eta n$ reactions in a chiral quark model
• On the background in the $\gamma p\to \omega ({\pi }^0\gamma )p$ reaction and mixed event simulation
• Phenomenological studies of double charged pion electroproduction from the CLAS data
• Updates on the Studies of $N^{\ast }$ Structure with CLAS and the Prospects with CLAS12
• Global Data-Driven Determination of Baryon Transition Form Factors
• Spectral-fluctuations test of the quark-model baryon spectrum
• Theory of two-pion photo- and electroproduction off the nucleon
• Partial wave expansion for photoproduction of two pseudoscalars on a nucleon
• Open flavor strong decays
• Recent results on nucleon resonance electrocouplings from the studies of ${\pi }^{+}{\pi }^{-}p$ electroproduction with the CLAS detector
• Highlights of Recent Results with Clas
• Relativistic five-quark equations and exotic baryons with isospin I=5/2
• Meson Production and Baryon Resonances at CLAS
• Running Masses in the Nucleon and its Resonances
• Analysis of CLAS data on double charge pion electroproduction
• The Jlab Upgrade - Studies of the Nucleon with CLAS12
• Probing the nucleon structure with CLAS