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arXiv 0912.4119hep-lat
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一个时间复杂度为O(a^2)的Dirac算子

O(a^2) improvement of the overlap-Dirac operator

H. Ikeda, S. Hashimoto

摘要:

在Symanzik改进程序的基础上,通过设计一个改进的重叠核,构造了一个$O(a^2)$ -改进的Escherich-Dirac算子.场旋转项也被确定为改善无质量和大质量费米子的离壳振幅。我们检验了自由色散关系和传播子,发现改进后的结果在低动量区更接近于连续谱的结果。我们检验了改进后的全QCD规范位形的效果,发现在$m_qa \approx 0.5$以内,相对论色散关系在百分之几的误差范围内是满足的。

英文摘要:

We construct an $O(a^2)$-improved overlap-Dirac operator by designing an improved overlap kernel, based on the Symanzik improvement program. Field rotation terms are also identified to improve off-shell amplitudes for both massless and massive fermions. We check the free dispersion relation and propagator, and show that improved results become to close to the continuum ones at low momentum region. We test the effect of improvement on the full-QCD gauge configuration and find that the relativistic dispersion relation is satisfied within a few percent error up to $m_qa \approx 0.5$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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