Volume 363 - 37th International Symposium on Lattice Field Theory (LATTICE2019) - Main session
Scaling and higher twist in the nucleon Compton amplitude
R. Young,* A. Hannaford-Gunn, R. Horsley, Y. Nakamura, H. Perlt, P.E.L. Rakow, G. Schierholz, K. Somfleth, H. Stuben, J. Zanotti on behalf of QCDSF-UKQCD-CSSM collaboration
*corresponding author
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Pre-published on: 2020 January 14
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Abstract
The partonic structure of hadrons plays an important role in a vast array of high-energy and nuclear physics experiments. It also underpins the theoretical understanding of hadron structure. Recent developments in lattice QCD offer new opportunities for reliably studying partonic structure from first principles. Here we report on the use of the Feynman-Hellmann theorem to study the forward Compton amplitude in the unphysical region. We demonstrate how this amplitude provides direct constraint on hadronic inelastic structure functions. The use of external momentum transfer allows us to study the $Q^2$ evolution to explore the onset of asymptotic scaling and reveal higher-twist effects in partonic structure.
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