期刊
PHYSICAL REVIEW D
卷 89, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.89.074509
关键词
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资金
- U.S. DOE [DE-AC05-06OR23177]
- DFG [SFB/TR 16, SFG 634]
- DOE Grant [DE-FG02-00ER41132]
- U.S. Department of Energy (DOE) [DE-FG02-00ER41132] Funding Source: U.S. Department of Energy (DOE)
We explore the use of twisted boundary conditions in extracting the nucleon mass and the binding energy of two-baryon systems, such as the deuteron, from lattice QCD calculations. Averaging the results of calculations performed with periodic and antiperiodic boundary conditions imposed upon the light-quark fields, or other pairwise averages, improves the volume dependence of the deuteron binding energy from similar to e(-kL)/L to similar to e(-root 2kL)/L. However, a twist angle of pi/2 in each of the spatial directions improves the volume dependence from similar to e(-kL)/L to similar to e(-2kL)/L. Twist averaging the binding energy with a random sampling of twist angles improves the volume dependence from similar to e(-kL)/L to similar to e(-2kL)/L, but with a standard deviation of similar to e(-kL)/L, introducing a signal-to-noise issue in modest lattice volumes. Using the experimentally determined phase shifts and mixing angles, we determine the expected energies of the deuteron states over a range of cubic lattice volumes for a selection of twisted boundary conditions.
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