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arXiv 0908.0451hep-lat
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格点Wilson费米子模拟中的O(a^2)截止效应

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

P. Dimopoulos, R. Frezzotti, C. Michael, G. C. Rossi, C. Urbach

摘要:

在本文中,我们提出将最大扭曲格点量子色动力学模拟中影响中性π介子质量的大离散伪影解释为O(a^2)效应,其大小大致与真空和一π介子态之间的赝标密度算符的(连续)矩阵元的模平方成正比。这个量的数值大小是由自发手征对称性破缺的动力学机制决定的,并且实际上大于由Lambda_QCD值设定的自然大小。

英文摘要:

In this paper we propose to interpret the large discretization artifacts affecting the neutral pion mass in maximally twisted lattice QCD simulations as O(a^2) effects whose magnitude is roughly proportional to the modulus square of the (continuum) matrix element of the pseudoscalar density operator between vacuum and one-pion state. The numerical size of this quantity is determined by the dynamical mechanism of spontaneous chiral symmetry breaking and turns out to be substantially larger than its natural magnitude set by the value of Lambda_QCD.

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