期刊
PHYSICAL REVIEW LETTERS
卷 128, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.052003
关键词
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资金
- DOE Office of Science Early Career Award [DE-SC0021147]
- DOE [DE-SC0010339]
- NSFC of China [12125501, 12070131001, 12141501, 11775002]
- National Key Research and Development Program of China [2020YFA0406400]
- DOE Office of Science Facility [DE-AC02-06CH11357]
- Office of Science of the U.S. Department of Energy
- U.S. Department of Energy (DOE) [DE-SC0021147] Funding Source: U.S. Department of Energy (DOE)
In this study, the infinite volume reconstruction method is used to calculate the mass difference between charged and neutral pions. The hadronic tensor is computed using lattice QCD and combined with an analytic photon propagator. By performing a continuum extrapolation and examining finite-volume effects, the calculated pion mass splitting is found to agree well with experimental measurements.
We use the infinite volume reconstruction method to calculate the charged and neutral pion mass difference. The hadronic tensor is calculated using lattice QCD and then combined with an analytic photon propagator, and the mass splitting is calculated with exponentially suppressed finite-volume errors. The calculation is performed using six gauge ensembles generated with 2 + 1-flavor domain wall fermions, and five ensembles are at the physical pion mass. Both Feynman and Coulomb gauges are adopted in the calculation and agree well when the lattice spacing approaches zero. After performing the continuum extrapolation and examining the residual finite-volume effects, we obtain the pion mass splitting Delta m pi = 4.534(42)stat(43)sys MeV, which agrees well with experimental measurements.
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