Resonant contributions to inclusive nucleon structure functions from exclusive meson electroproduction data

Nucleon resonance contributions to the inclusive proton F-2 and F-L structure functions are computed from resonance electroexcitation amplitudes in the mass range up to 1.75 GeV extracted from CLAS exclusive meson electroproduction data, taking into account interference between different excited nucleon states. The resonance contributions are compared with inclusive proton structure functions evaluated from (e, e'X) cross section data and the longitudinal to transverse cross section ratio. Contributions from isospin-1/2 and -3/2 resonances remain substantial over the entire range of photon virtualities Q(2) less than or similar to 4 GeV2, where their electroexcitation amplitudes have been obtained, and their Q(2) evolution displays pronounced differences in the first, second, and third resonance regions. We compare the structure functions in the resonance region with those computed from parton distributions fitted to deep-inelastic scattering data, and extrapolated to the resonance region, providing new quantitative assessments of quark-hadron duality in inclusive electron-proton scattering.

Automated summary

Nucleon resonance contributions to the inclusive proton F-2 and F-L structure functions are calculated using resonance electroexcitation amplitudes extracted from experimental data. Contributions from isospin-1/2 and -3/2 resonances remain significant in the range of photon virtuality Q(2) less than or similar to 4 GeV2, showing pronounced differences in their Q(2) evolution in different resonance regions. Comparison between structure functions in the resonance region and those calculated from parton distributions provides new quantitative assessments of quark-hadron duality in inclusive electron-proton scattering.