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@INPROCEEDINGS{Fodor:151397,
author = {Fodor, Zoltan and Krieg, Stefan and Lippert, Thomas},
title = {{I}sospin {S}plittings in the {L}ight {B}aryon {O}ctet from
{L}attice {QCD}+{QED} at the{P}hysical {M}ass {P}oint},
volume = {47},
address = {Jülich},
publisher = {John von Neumann Institute for Computing},
reportid = {FZJ-2014-01363},
series = {NIC Series},
pages = {159-168},
year = {2014},
comment = {NIC Symposium 2014 - Proceedings},
booktitle = {NIC Symposium 2014 - Proceedings},
abstract = {Electromagnetic effects and the up-down quark mass
difference have small but highly important effects on octet
baryon masses. A prominent example is the stability of the
hydrogen atom against beta decay. Here we report on a
calculation1 that includes these effects by adding them to
valence quarks in an Nf=2+1 lattice Quantum Chromodynamics
calculation based on ensembles with 5 lattice spacings down
to 0.054 fm, lattice sizes up to 6 fm, and average up-down
quark masses all the way down to their physical value. This
large parameter space allows us to gain control over all
systematic errors, with the exception of the one associated
with neglecting electromagnetism in the sea. We compute the
octet baryon isomultiplet mass splittings, as well as the
individual contributions from electromagnetism and the
up-down quark mass difference. Our results for the total
splittings are in good agreement with experiment.},
month = {Feb},
date = {2014-02-12},
organization = {NIC Symposium 2014, Jülich (Germany),
12 Feb 2014 - 13 Feb 2014},
cin = {JSC},
cid = {I:(DE-Juel1)JSC-20090406},
pnm = {411 - Computational Science and Mathematical Methods
(POF2-411)},
pid = {G:(DE-HGF)POF2-411},
typ = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
url = {https://juser.fz-juelich.de/record/151397},
}