Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006slft.confe.173d&link_type=abstract
Proceedings of the XXIVth International Symposium on Lattice Field Theory. July 23-28, 2006, Tucson, Arizona., p.173.1
Physics
Scientific paper
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 mul- tiplets 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 collab- oration 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.
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