arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0910.2795hep-lat
收藏

甚高阶晶格微扰理论中的威尔逊圈

Wilson loops in very high order lattice perturbation theory

E. -M. Ilgenfritz, Y. Nakamura, H. Perlt, P. E. L. Rakow, G. Schierholz, A. Schiller

摘要:

我们用数值随机微扰理论在淬灭QCD中计算了$L^4 (L=4, 6, 8, 12)$晶格尺寸下的各种尺寸的威尔逊圈,直到圈阶$n=20$。这允许调查的行为的扰动系列在高阶。我们讨论了三种模型来估计扰动序列:一个renormalon启发适合,启发式适合假设的幂律奇异性和提升扰动理论的基础上。我们发现,在中等$n$下,较小和较大的威尔逊圈的微扰级数的行为存在差异。无法确认系数的阶乘增长高达$n=20$。根据Monte Carlo测量的元格数据和我们的微扰结果,我们估计了胶子凝聚$<\fracαπGG>$的一个值。

英文摘要:

We calculate Wilson loops of various sizes up to loop order $n=20$ for lattice sizes of $L^4 (L=4, 6, 8, 12)$ using the technique of Numerical Stochastic Perturbation Theory in quenched QCD. This allows to investigate the behaviour of the perturbative series at high orders. We discuss three models to estimate the perturbative series: a renormalon inspired fit, a heuristic fit based on an assumed power-law singularity and boosted perturbation theory. We have found differences in the behavior of the perturbative series for smaller and larger Wilson loops at moderate $n$. A factorial growth of the coefficients could not be confirmed up to $n=20$. From Monte Carlo measured plaquette data and our perturbative result we estimate a value of the gluon condensate $<\fracαπGG>$.

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。

↑