Can, KU, Hannaford-Gunn, A, Horsley, R, Nakamura, Y, Perlt, H, Rakow, PEL, Schierholz, G, Somfleth, KY, Stueben, H, Young, RD et al (show 1 more authors)
(2020)
Lattice QCD evaluation of the Compton amplitude employing the Feynman-Hellmann theorem.
PHYSICAL REVIEW D, 102 (11).
114505-.
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2007.01523.pdf - Author Accepted Manuscript Download (1MB) | Preview |
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 15 Jul 2021 07:49 |
| Last Modified: | 21 Jun 2024 03:26 |
| DOI: | 10.1103/PhysRevD.102.114505 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3130066 |
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