Ab initio calculation of the neutron-proton mass difference. Borsanyi, S., Durr, S., Fodor, Z., Hoelbling, C., Katz, S. D., Krieg, S., Lellouch, L., Lippert, T., Portelli, A., Szabo, K. K., & Toth, B. C. *Science*, 347(6229):1452–1455, 2015. Paper doi abstract bibtex 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 $Ξ$cc isospin multiplets, exceeding in some cases the precision of experimental measurements.

@Article{borsanyi15ab,
author = {Borsanyi, Sz 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, K. K. and Toth, B. C.},
title = {Ab initio calculation of the neutron-proton mass difference.},
journal = {Science},
year = {2015},
volume = {347},
number = {6229},
pages = {1452--1455},
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 $\Sigma$, $\Xi$, D, and $\Xi$cc isospin multiplets, exceeding in some cases the precision of experimental measurements.},
doi = {10.1126/science.1257050},
owner = {kerstin},
pii = {347/6229/1452},
pmid = {25814578},
timestamp = {2015.10.01},
url = {http://dx.doi.org/10.1126/science.1257050},
}

Downloads: 0

{"_id":"gBBfqyq5kYPxRqmPx","bibbaseid":"borsanyi-durr-fodor-hoelbling-katz-krieg-lellouch-lippert-etal-abinitiocalculationoftheneutronprotonmassdifference-2015","authorIDs":[],"author_short":["Borsanyi, S.","Durr, S.","Fodor, Z.","Hoelbling, C.","Katz, S. D.","Krieg, S.","Lellouch, L.","Lippert, T.","Portelli, A.","Szabo, K. K.","Toth, B. C."],"bibdata":{"bibtype":"article","type":"article","author":[{"propositions":[],"lastnames":["Borsanyi"],"firstnames":["Sz"],"suffixes":[]},{"propositions":[],"lastnames":["Durr"],"firstnames":["S."],"suffixes":[]},{"propositions":[],"lastnames":["Fodor"],"firstnames":["Z."],"suffixes":[]},{"propositions":[],"lastnames":["Hoelbling"],"firstnames":["C."],"suffixes":[]},{"propositions":[],"lastnames":["Katz"],"firstnames":["S.","D."],"suffixes":[]},{"propositions":[],"lastnames":["Krieg"],"firstnames":["S."],"suffixes":[]},{"propositions":[],"lastnames":["Lellouch"],"firstnames":["L."],"suffixes":[]},{"propositions":[],"lastnames":["Lippert"],"firstnames":["T."],"suffixes":[]},{"propositions":[],"lastnames":["Portelli"],"firstnames":["A."],"suffixes":[]},{"propositions":[],"lastnames":["Szabo"],"firstnames":["K.","K."],"suffixes":[]},{"propositions":[],"lastnames":["Toth"],"firstnames":["B.","C."],"suffixes":[]}],"title":"Ab initio calculation of the neutron-proton mass difference.","journal":"Science","year":"2015","volume":"347","number":"6229","pages":"1452–1455","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 $Ξ$cc isospin multiplets, exceeding in some cases the precision of experimental measurements.","doi":"10.1126/science.1257050","owner":"kerstin","pii":"347/6229/1452","pmid":"25814578","timestamp":"2015.10.01","url":"http://dx.doi.org/10.1126/science.1257050","bibtex":"@Article{borsanyi15ab,\n author = {Borsanyi, Sz 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, K. K. and Toth, B. C.},\n title = {Ab initio calculation of the neutron-proton mass difference.},\n journal = {Science},\n year = {2015},\n volume = {347},\n number = {6229},\n pages = {1452--1455},\n 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 $\\Sigma$, $\\Xi$, D, and $\\Xi$cc isospin multiplets, exceeding in some cases the precision of experimental measurements.},\n doi = {10.1126/science.1257050},\n owner = {kerstin},\n pii = {347/6229/1452},\n pmid = {25814578},\n timestamp = {2015.10.01},\n url = {http://dx.doi.org/10.1126/science.1257050},\n}\n\n","author_short":["Borsanyi, S.","Durr, S.","Fodor, Z.","Hoelbling, C.","Katz, S. D.","Krieg, S.","Lellouch, L.","Lippert, T.","Portelli, A.","Szabo, K. K.","Toth, B. C."],"key":"borsanyi15ab","id":"borsanyi15ab","bibbaseid":"borsanyi-durr-fodor-hoelbling-katz-krieg-lellouch-lippert-etal-abinitiocalculationoftheneutronprotonmassdifference-2015","role":"author","urls":{"Paper":"http://dx.doi.org/10.1126/science.1257050"},"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://git.bio.informatik.uni-jena.de/fleisch/literature/raw/master/group-literature.bib","creationDate":"2019-11-19T16:50:41.648Z","downloads":0,"keywords":[],"search_terms":["initio","calculation","neutron","proton","mass","difference","borsanyi","durr","fodor","hoelbling","katz","krieg","lellouch","lippert","portelli","szabo","toth"],"title":"Ab initio calculation of the neutron-proton mass difference.","year":2015,"dataSources":["C5FtkvWWggFfMJTFX","7fTi5NtYYKwjPXfpu"]}