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Massive Photons: An Infrared Regularization Scheme for Lattice QCD plus QED

Endres, Michael G.
; 
Shindler, Andrea
; 
Shindler, Andrea
; 
Walker-Loud, Andre
Abstract
Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by extrapolation requires costly computations at multiple volumes. We introduce a photon mass to alternatively regulate the infrared, and rely on effective field theory to remove its unphysical effects. Electromagnetic modifications to the hadron spectrum are reliably estimated with a precision and cost comparable to conventional approaches that utilize multiple larger volumes. A significant overall cost advantage emerges when accounting for ensemble generation. The proposed method may benefit lattice calculations involving multiple charged hadrons, as well as quantum many-body computations with long-range Coulomb interactions.
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2016-01-01
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massive_photons.pdf
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Physics
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https://doi.org/10.1103/PhysRevLett.117.072002
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https://scholarworks.wm.edu/handle/internal/1717
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