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@ARTICLE{Borsanyi:188968,
      author       = {Borsanyi, S. and Durr, S. and Fodor, Z. and Hoelbling, C.
                      and Katz, S. D. and Krieg, S. and Lellouch, L. and Lippert,
                      T. and Portelli, A. and Szabo, Kalman and Toth, B. C.},
      title        = {{A}b initio calculation of the neutron-proton mass
                      difference},
      journal      = {Science},
      volume       = {347},
      number       = {6229},
      issn         = {1095-9203},
      address      = {Washington, DC [u.a.]},
      publisher    = {American Association for the Advancement of Science64196},
      reportid     = {FZJ-2015-02252},
      pages        = {1452 - 1455},
      year         = {2015},
      note         = {Preprint: http://arxiv.org/abs/arXiv:1406.4088},
      abstract     = {The existence and stability of atoms rely on the fact that
                      neutrons are more massive than protons. The measured mass
                      difference is only $0.14\%$ of the average of the two
                      masses. A slightly smaller or larger value would have led to
                      a dramatically different universe. Here, we show that this
                      difference results from the competition between
                      electromagnetic and mass isospin breaking effects. We
                      performed lattice quantum-chromodynamics and
                      quantum-electrodynamics computations with four nondegenerate
                      Wilson fermion flavors and computed the neutron-proton
                      mass-splitting with an accuracy of 300 kilo–electron
                      volts, which is greater than 0 by 5 standard deviations. We
                      also determine the splittings in the Σ, Ξ, D, and Ξcc
                      isospin multiplets, exceeding in some cases the precision of
                      experimental measurements.},
      cin          = {JSC},
      ddc          = {500},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511)},
      pid          = {G:(DE-HGF)POF3-511},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000352136400034},
      pubmed       = {pmid:25814578},
      doi          = {10.1126/science.1257050},
      url          = {https://juser.fz-juelich.de/record/188968},
}