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Type: Journal article
Title: Lattice QCD evaluation of the Compton amplitude employing the Feynman-Hellmann theorem
Author: Can, K.U.
Hannaford-Gunn, A.
Horsley, R.
Nakamura, Y.
Perlt, H.
Rakow, P.E.L.
Schierholz, G.
Somfleth, K.Y.
Stüben, H.
Young, R.D.
Zanotti, J.M.
Citation: Physical Review D, 2020; 102(11):114505-1-114505-18
Publisher: American Physical Society
Issue Date: 2020
ISSN: 2470-0010
Statement of
K. U. Can, A. Hannaford-Gunn, R. Horsley, Y. Nakamura, H. Perlt, P. E. L. Rakow, G. Schierholz, K. Y. Somfleth, H. Stüben, R. D. Young, and J. M. Zanotti (QCDSF/UKQCD/CSSM Collaborations)
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.
Description: Published 8 December 2020
Rights: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
RMID: 1000031633
DOI: 10.1103/physrevd.102.114505
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Appears in Collections:Physics publications

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