Lattice QCD calculation of the Compton amplitude subtraction function
The Compton amplitude subtraction function is an essential component in work concerning both the proton radius puzzle and the proton-neutron mass difference. However, owing to the difficulty in determining the subtraction function, it remains a key source of uncertainty in these two contexts. Here, we use the Feynman-Hellmann method to determine this subtraction function directly from lattice QCD. Furthermore, we demonstrate how to control dominant discretization artifacts for this calculation, eliminating a major source of systematic error. This calculation is performed for a range of hard momentum scales, and three different sets of gauge configurations for pion masses about 400 MeV. Our results show good agreement with continuum OPE expectations. As such, this work paves the way for model-independent and precise determinations of the subtraction function over a wide range of kinematics.
Authors
- G. Schierholz (ORCID: https://orcid.org/0000-0002-0262-5712)
- P. E. L. Rakow (ORCID: https://orcid.org/0000-0003-4486-2158)
- R. D. Young (ORCID: https://orcid.org/0000-0002-4527-1811)
- Kadir Utku Can (ORCID: https://orcid.org/0000-0002-7052-1421)
- H. Stüben (ORCID: https://orcid.org/0009-0008-5390-2012)
- A. Hannaford-Gunn (ORCID: https://orcid.org/0000-0002-1816-3137)
- J. M. Zanotti (ORCID: https://orcid.org/0000-0002-3936-1597)
- R. Horsley (ORCID: https://orcid.org/0000-0001-7402-5743)
- T. Schar (ORCID: https://orcid.org/0000-0002-8318-273X)
Institutions
- University of Liverpool (GB)
- Universität Hamburg (DE)
- Deutsches Elektronen-Synchrotron DESY (DE)
- The University of Adelaide (AU)
- University of Edinburgh (GB)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2025-05-20
- DOI
- https://doi.org/10.1103/physrevd.111.094513
- Citations
- 1
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 1.87
Funders
- Australian Government
- Deutsche Forschungsgemeinschaft
- University of Adelaide
- Government of Western Australia
- Gauss Centre for Supercomputing
- Science and Technology Facilities Council
- Australian Research Council
- National Cancer Institute