PoS - Proceedings of Science
Volume 396 - The 38th International Symposium on Lattice Field Theory (LATTICE2021) - Oral presentation
Generalised Parton Distributions from Lattice Feynman-Hellmann Techniques
A. Hannaford-Gunn*, R. Horsley, H. Perlt, P. Rakow, G. Schierholz, H. Stuben, R. Young, J. Zanotti, K.U. Can  on behalf of CSSM/QCDSF/UKQCD Collaboration
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Pre-published on: May 16, 2022
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Abstract
We report on the use of Feynman-Hellmann techniques to calculate the off-forward Compton amplitude (OFCA) in lattice QCD. At leading-twist, the Euclidean OFCA is parameterised by the Mellin moments of generalised parton distributions (GPDs). Hence we extract GPD moments for two values of the soft momentum transfer, $t=-1.10, -2.20\;\text{GeV}^2$ and zero-skewness kinematics at an unphysical pion mass of $m_{\pi}\approx 470\;\text{MeV}$. This includes the first determination of the $n=4$ moments.
DOI: https://doi.org/10.22323/1.396.0088
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