title: Massive Photons: An Infrared Regularization Scheme for Lattice QCD+QED.
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.
authors: Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: Michael G
authors: MG
authors: Endres
authors: IAS, IKP and JCHP, Forschungszentrum Jülich, 52428 Jülich, Germany.
authors: Andrea
authors: A
authors: Shindler
authors: Department of Physics, The City College of New York, New York, New York 10031, USA.|Graduate School and University Center, The City University of New York, New York, New York 10016, USA.|RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors: Brian C
authors: BC
authors: Tiburzi
authors: Department of Physics, College of William and Mary, Williamsburg, Virginia 23187-8795, USA.|Jefferson Laboratory, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA.|Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors: André
authors: A
authors: Walker-Loud