出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The Asqtad improved staggered fermion formalism has been a valuable tool in successfully calculating
the non-singlet parts of the hadronic spectrum. We are engaged in a project to calculate
the spectrum of the pseudoscalar singlet mesons with 2+1-flavor Asqtad staggered gauge configurations.
Propagators of flavor-singlet states incorporate contributions from both disconnected
and connected diagrams, and hence are sensitive to any differences in the actions governing the
sea and valence fermions on the lattice. As such, they also present the possibility of a probe of
the validity of the “fourth-root trick” in the staggered fermion formulation. We present an update
on our progress toward measuring the h0 mass on 2+1-flavor Asqtad staggered gauge configurations,
including a review of methods and preliminary results. We also show a strong correlation
between Tr(g5 1) and the topological charge in these configurations, as predicted by the index
theorem.
