Short distance singularities and automatic O(a) improvement: the cases of the chiral condensate and the topological susceptibility

Cichy Krzysztof<sup>*</sup>; Garcia Ramos Elena; Jansen Karl

doi:10.1007/JHEP04(2015)048

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Short distance singularities and automatic O(a) improvement: the cases of the chiral condensate and the topological susceptibility

作者：Cichy Krzysztof^*; Garcia Ramos Elena; Jansen Karl

来源：The Journal of High Energy Physics, 2015, 2015(4): 048.

DOI：10.1007/JHEP04(2015)048

摘要

Short-distance singularities in lattice correlators can modify their Symanzik expansion by leading to additional O(a) lattice artifacts. At the example of the chiral condensate and the topological susceptibility, we show how to account for these lattice artifacts for Wilson twisted mass fermions and show that the property of automatic O(a) improvement is preserved at maximal twist.