The chiral low-energy constants c-D and c-E are constrained by means of accurate ab initio calculations of the A=3 binding energies and, for the first time, of the triton beta decay. We demonstrate that these low-energy observables allow a robust determination of the two undetermined constants. The consistency of the interactions and currents in chiral effective field theory is crucial to this remarkable result. The two-plus three-nucleon interactions from chiral effective field theory defined by properties of the A=2 system and the present determination of c-D and c-E are successful in predicting properties of the A=3, and 4 systems.
Bibliographical noteFunding Information:
We thank E. Epelbaum, S. Pastore, R. Schiavilla, and K. Wendt for useful discussions. Computing support for this work came from the LLNL institutional Computing Grand Challenge program. Prepared in part by LLNL under Contract DE-AC52-07NA27344. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Work Proposal No. SCW1579, the LDRD project 18-ERD-008, and by the NSERC Grants No. 401945-2011 and No. SAPIN-2016-00033. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada.
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