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arXiv 0710.2492hep-lat
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Wilson费米子模拟中的O(a^2)截止效应

O(a^2) cutoff effects in Wilson fermion simulations

Roberto Frezzotti, Giancarlo Rossi

摘要:

我们发现,在最大扭曲威尔逊费米子模拟中发现的影响中性π介子质量的O(a^2)味违反截止伪影的大小是由一个相当大的连续QCD量控制的,并且是由自发手征对称性破缺的动力学机制决定的。人们可以说中性π介子质量是唯一被这种截止效应所模糊的物理量。这种O(a^2)修正也存在于标准的威尔逊费米子模拟中,但它们可能会影响π介子质量的测定,也可能会从后者转移到其他可观测量,这取决于临界质量的计算方法。

英文摘要:

We show that the size of the O(a^2) flavour violating cutoff artifacts that have been found to affect the value of the neutral pion mass in simulations with maximally twisted Wilson fermions is controlled by a continuum QCD quantity that is fairly large and is determined by the dynamical mechanism of spontaneous chiral symmetry breaking. One can argue that the neutral pion mass is the only physical quantity blurred by such cutoff effects. O(a^2) corrections of this kind are also present in standard Wilson fermion simulations, but they can either affect the determination of the pion mass or be shifted from the latter to other observables, depending on the way the critical mass is evaluated.

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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