DOMAIN WALL QUARKS AND KAON WEAK MATRIX ELEMENTS
DOMAIN WALL QUARKS AND KAON WEAK MATRIX ELEMENTS
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DOI：
10.1103/physrevlett.79.3595
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发表时间：
1997-06
影响因子：
8.6
通讯作者：
T. Blum;A. Soni
中科院分区：
文献类型：
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作者：
T. Blum;A. Soni
我们提出了晶格计算的K介子矩阵元与畴壁费米子。使用β =5.85，6.0和6.3的晶格，我们估计了猝灭QCD中的B_K（约2 GeV）=0.628（47），这与以前的计算结果一致。在β =6.0和5.85时，我们发现f_K/m_ρ的比值与实验值在误差范围内是一致的。这些结果支持了O（a）误差在低能（E<< a^{-1}）可观测量中呈指数抑制的预期，并表明域壁费米子在相对强的耦合下具有良好的标度行为。我们还表明，轴向电流数值满足通常的连续轴向沃德恒等式的晶格模拟。
We present lattice calculations of kaon matrix elements with domain wall fermions. Using lattices with beta=5.85, 6.0, and 6.3, we estimate B_K(approx 2 GeV)=0.628(47) in quenched QCD which is consistent with previous calculations. At beta=6.0 and 5.85 we find the ratio f_K/m_rho in agreement with the experimental value, within errors. These results support expectations that O(a) errors are exponentially suppressed in low energy (E<< a^{-1}) observables, and indicate that domain wall fermions have good scaling behavior at relatively strong couplings. We also demonstrate that the axial current numerically satisfies the lattice analog of the usual continuum axial Ward identity.