The effects of electromagnetic interactions on pseudoscalar decay constants are investigated. Using a compact QED and QCD action we are able to resolve differences of about 0.1 MeV. We obtain the preliminary results f_pi^0-f_pi^+/- =0.09(3) MeV and f_D^0-f_D^+/- =0.79(11) MeV for light and charmed pseudoscalar decay constants on a N_f=2 nonperturbatively improved Sheikholeslami-Wohlert ensemble.
@article{arxiv.1111.3958,
title = {Electromagnetic corrections to pseudoscalar decay constants},
author = {Benjamin Glaessle and Gunnar S. Bali},
journal= {arXiv preprint arXiv:1111.3958},
year = {2015}
}
Comments
7 pages, 3 figures. Talk presented at the XXIX International Symposium on Lattice Field Theory, Lattice2011, Squaw Valley, Lake Tahoe, California, July 2011