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Open Access Publications from the University of California

Massive Photons: An Infrared Regularization Scheme for Lattice QCD+QED.

  • Author(s): Endres, Michael G;
  • Shindler, Andrea;
  • Tiburzi, Brian C;
  • Walker-Loud, André
  • et al.

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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