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001     188968
005     20210129215303.0
024 7 _ |a 10.1126/science.1257050
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037 _ _ |a FZJ-2015-02252
082 _ _ |a 500
100 1 _ |a Borsanyi, S.
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245 _ _ |a Ab initio calculation of the neutron-proton mass difference
260 _ _ |a Washington, DC [u.a.]
|c 2015
|b American Association for the Advancement of Science64196
336 7 _ |a Journal Article
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500 _ _ |a Preprint: http://arxiv.org/abs/arXiv:1406.4088
520 _ _ |a 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.
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700 1 _ |a Durr, S.
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700 1 _ |a Fodor, Z.
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700 1 _ |a Hoelbling, C.
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700 1 _ |a Katz, S. D.
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700 1 _ |a Krieg, S.
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700 1 _ |a Lellouch, L.
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700 1 _ |a Lippert, T.
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700 1 _ |a Portelli, A.
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700 1 _ |a Szabo, Kalman
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700 1 _ |a Toth, B. C.
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773 _ _ |a 10.1126/science.1257050
|g Vol. 347, no. 6229, p. 1452 - 1455
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856 4 _ |u http://inspirehep.net/record/1300659
856 4 _ |u https://juser.fz-juelich.de/record/188968/files/1406.4088v2.pdf
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