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Volume 256 - 34th annual International Symposium on Lattice Field Theory (LATTICE2016) - Plenary
QED Corrections to Hadronic Observables
A. Patella
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Pre-published on: 2017-02-19 21:57:33
Published on: 2017-03-24 10:20:24
When aiming at the percent precision in hadronic quantities calculated by means of lattice simulations, isospin breaking effects become relevant. These are of two kinds: up/down mass splitting and electromagnetic corrections. In order to account properly for the latter, a consistent formulation of electrically-charged states in finite volume is needed. In fact on a periodic torus Gauss law and large gauge transformations forbid the propagation of electrically-charged states. In this talk I will review methods that have been used or proposed so far in order to circumvent this problem, while highlighting practical as well as conceptual pros and cons. I will also review and discuss various methods to calculate electromagnetic corrections to hadron masses and decay rates in numerical simulations.
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