Kinematically complete measurement of the proton structure functionF2in the resonance region and evaluation of its moments

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Abstract

We measured the inclusive electron-proton cross section in the nucleon resonance region $(W<2.5\mathrm{GeV})$ at momentum transfers ${Q}^{2}$ below $4.5(\mathrm{GeV}{/c)}^{2}$ with the CLAS detector. The large acceptance of CLAS allowed the measurement of the cross section in a large, contiguous two-dimensional range of ${Q}^{2}$ and x, making it possible to perform an integration of the data at fixed ${Q}^{2}$ over the significant x interval. From these data we extracted the structure function ${F}_{2}$ and, by including other world data, we studied the ${Q}^{2}$ evolution of its moments, ${M}_{n}{(Q}^{2}),$ in order to estimate higher twist contributions. The small statistical and systematic uncertainties of the CLAS data allow a precise extraction of the higher twists and will require significant improvements in theoretical predictions if a meaningful comparison with these new experimental results is to be made.

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