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arXiv 1111.3815hep-lat
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O(a)改进的Wilson费米子的扭曲质量重加权

Twisted-mass reweighting for O(a) improved Wilson fermions

Chuan Miao, Harvey B. Meyer, Hartmut Wittig

摘要:

在区域分解的混合Monte-Carlo算法中,我们测试了O(a)改进的Wilson费米子的夸克行列式的重新加权。具体地说,我们在$N_{\rm f}=2$ QCD中实现了Palombi和Lüscher提出的扭曲质量参数的重新加权。我们发现,在相同的接受率,该算法是显着更稳定的$32\times64^3$格上切换后的重新加权参数。与此同时,重新加权系数不会大幅波动,因此处于控制之下。在相同的统计量下,π介子相关器的不确定性与标准的未加权算法的情况相当。

英文摘要:

We test the reweighting of the quark determinant of O(a) improved Wilson fermions in the domain-decomposed hybrid Monte-Carlo algorithm. Specifically, we implement a reweighting in a twisted-mass parameter proposed by Palombi and Lüscher in $N_{\rm f}=2$ QCD. We find that at equal acceptance rate, the algorithm is significantly more stable on a $32\times64^3$ lattice upon switching on the reweighting parameter. At the same time, the reweighting factor does not fluctuate strongly and hence is under control. At equal statistics, the uncertainty on the pion correlator is comparable to the case of the standard, unreweighted algorithm.

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