出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We study the behavior of the isovector scalar correlator, which is particularly sensitive to lattice
artifacts, using domain-wall valence quarks on a staggered sea (generated by theMILC collaboration).
We analyze this according to the prediction from chiral perturbation theory determined by
Prelovsek, which indicates that the leading unitarity violations come from taste breaking effects.
We show that our data behaves in the way predicted by Prelovsek, thus verifying that the largest
contribution to the violations of unitarity which arise at finite lattice spacing can be described by
the mixed-action chiral perturbation theory.
