出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：As a consistency check of the staggered-fermion fourth-root approximation, we analyze the a0
and f0 correlators, including the effects of two-meson taste-multiplet intermediate states. Rooted
staggered chiral perturbation theory describes the contributions from the pseudoscalar taste multiplets
in terms of only a few low energy constants, which have all been previously determined
by the MILC collaboration. In previous work one of us (Prelovsek) showed that the two-meson
“bubble” contributions could explain the observed anomalies in the lattice data for the isovector
a0 channel. In the present work we extend this analysis to the f0 channel. On a MILC collaboration
lattice ensemble at 0.12 fm with 2+1 flavors of Asqtad-improved staggered fermions,
we have made new measurements of correlators in both channels for a variety of momenta. A
fit to these correlators gives low energy constants that are reasonably consistent with previous
determinations by the MILC collaboration.
