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Abstract
The forward Compton amplitude describes the process of virtual photon scattering from a hadron and provides an essential ingredient for the understanding of hadron structure. As a physical amplitude, the Compton tensor naturally includes all target mass corrections and higher twist effects at a fixed virtuality, Q2. By making use of the second-order Feynman-Hellmann theorem, the nucleon Compton tensor is calculated in lattice QCD at an unphysical quark mass across a range of photon momenta 3≲Q2≲7 GeV2. This allows for the Q2 dependence of the low moments of the nucleon structure functions to be studied in a lattice calculation for the first time. The results demonstrate that a systematic investigation of power corrections and the approach to parton asymptotics is now within reach.
Original language | English |
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Article number | 114505 |
Pages (from-to) | 1-18 |
Number of pages | 18 |
Journal | Physical Review D |
Volume | 102 |
Issue number | 11 |
DOIs | |
Publication status | Published - 8 Dec 2020 |
Keywords
- hep-lat
- hep-ph
- hep-th
- nucl-th
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Dive into the research topics of 'Lattice QCD evaluation of the Compton amplitude employing the Feynman-Hellmann theorem'. Together they form a unique fingerprint.Projects
- 1 Finished
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Particle Theory at the Higgs Centre
Ball, R., Boyle, P., Del Debbio, L., Gardi, E., Horsley, R., Kennedy, A., O'Connell, D., Smillie, J. & Zwicky, R.
1/10/17 → 30/09/21
Project: Research