Extracting meson-baryon contributions to the electroexcitation of the $N(1675){\frac{5}{2}}^{-}$ nucleon resonance

Abstract

We report on the determination of the electrocouplings for the transition from the proton to the $N(1675){\frac{5}{2}}^{-}$ resonance state using recent differential cross section data on $ep\to e{\pi }^{+}n$ by the CLAS collaboration at $1.8\le Q^2<4.5$GeV${}^2$. The data have been analyzed using two different approaches, the unitary isobar model and fixed-t dispersion relations. The extracted ${\gamma }^{\ast }p\to N(1675){\frac{5}{2}}^{-}$ helicity amplitudes show considerable coupling through the $A_{1/2}^p$ amplitude, that is significantly larger than predicted three-quark contribution to this amplitude. The amplitude $A_{3/2}^p$ is much smaller. Both results are consistent with the predicted sizes of the meson-baryon contributions at $Q^2\ge 1.8$GeV${}^2$ from the dynamical coupled-channel model.

4 pages, 3 figures. arXiv admin note: text overlap with arXiv:1412.0274

References in corpus (8)

• Global analysis of proton elastic form factor data with two-photon exchange corrections
• Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Measurements of the Electric Form Factor of the Neutron up to Q2=3.4 GeV2 using the Reaction He3(e,e'n)pp
• Dynamical Coupled-Channels Effects on Pion Photoproduction
• A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark Model
• Light baryon magnetic moments and N -> Delta gamma transition in a Lorentz covariant chiral quark approach
• Measurements of $ep\to e^{\prime }{\pi }^{+}n$ at W = 1.6 - 2.0 GeV and extraction of nucleon resonance electrocouplings at CLAS

Cited by in corpus (5)

• 50 Years of Quantum Chromodynamics
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• 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${}^2$
• Electromagnetic Transition Form Factors of Baryon Resonances
• Spectrum and Structure of Excited Baryons with CLAS