期刊
PHYSICAL REVIEW D
卷 99, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.074510
关键词
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资金
- U.S. Department of Energy [DE-FG02-00ER41132, DE-SC0012704]
- RIKEN Special Postdoctoral Researcher fellowship
- RHIC Physics Fellow Program of the RIKEN BNL Research Center
- MIT Pappalardo Fellowship
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-SC0011090]
- Office of Science of the U.S. Department of Energy
- DOE Office of Science User Facility [DE-AC02-06CH11357]
- U.S. Department of Energy by Lawrence Livermore National Laboratory (Lawrence Livermore National Security, LLC) [DE-AC52-07NA27344]
Matrix elements of six-quark operators are needed to extract new physics constraints from experimental searches for neutron-antineutron oscillations. This work presents, in detail, the first lattice quantum chromodynamics calculations of the necessary neutron-antineutron transition matrix elements including calculation methods and discussions of systematic uncertainties. Implications of isospin and chiral symmetry on the matrix elements, power counting in the isospin limit, and renormalization of a chiral basis of six-quark operators are discussed. Calculations are performed with a chiral-symmetric discretization of the quark action and physical light quark masses in order to avoid the need for chiral extrapolation. Nonperturbative renormalization is performed, including a study of lattice cutoff effects. Excited-state effects are studied using two nucleon operators and multiple values of source-sink separation. Results for the dominant matrix elements are found to be significantly larger compared to previous results from the MIT bag model. Future calculations are needed to fully account for systematic uncertainties associated with discretization and finite-volume effects but arc not expected to significantly affect this conclusion.
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