文章基本信息

标题：The art of smearing - can one reach M_pi = 140 MeV in quenched QCD with clover quarks ?
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作者：S. Durr
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2007
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Several smearing recipes (APE, stout, and a new LOG smearing) are discussed and compared, without and with the hypercubic nesting trick, which may be applied to each one of them. While theU(1) projection in the APE recipe creates a challenge in dening the derivative of the smeared link with respect to the original one, the latter two recipes yield differentiable fat links. This makes them interesting for building UV-ltered fermion actions which can be simulated with a HMC algorithm. This contribution discusses the plaquette distribution and how it is affected by these recipes and their hypercubic descendents. Subsequently, the issue of how light a pion one may simulate in the quenched approximation with such low-cost nearly-chiral actions is addressed.