期刊
PHYSICS LETTERS B
卷 766, 期 -, 页码 254-262出版社
ELSEVIER
DOI: 10.1016/j.physletb.2017.01.017
关键词
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资金
- US DOE Office of Nuclear Physics
- LDRD program at Los Alamos National Laboratory
- Dutch Organization for Scientific Research (NWO) through a VENI grant
- National Natural Science Foundation of China [11575110, 11175115]
- Natural Science Foundation of Shanghai [15DZ2272100, 15ZR1423100]
- U.S. Department of Energy, Office of Science, Scientific Discovery through Advanced Computing (SciDAC) program [KB0301052]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics, Double Beta Decay Topical Collaboration [DE-SC0015376]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics, Early Career Research Program under FWP [NQCDAWL]
The interpretation of nuclear electric dipole moment (EDM) experiments is clouded by large theoretical uncertainties associated with nonperturbative matrix elements. In various beyond-the-Standard Model scenarios nuclear and diamagnetic atomic EDMs are expected to be dominated by CP-violating pionnucleon interactions that arise from quark chromo-electric dipole moments. The corresponding CPviolating pion-nucleon coupling strengths are, however, poorly known. In this work we propose a strategy to calculate these couplings by using spectroscopic lattice QCD techniques. Instead of directly calculating the pion-nucleon coupling constants, a challenging task, we use chiral symmetry relations that link the pion-nucleon couplings to nucleon sigma terms and mass splittings that are significantly easier to calculate. In this work, we show that these relations are reliable up to next-to-next-to-leading order in the chiral expansion in both SU(2) and SU(3) chiral perturbation theory. We conclude with a brief discussion about practical details regarding the required lattice QCD calculations and the phenomenological impact of an improved understanding of CP-violating matrix elements. (C) 2017 Published by Elsevier B.V.
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