Chiral Loop Effects in the Quenched Scalar Isovector Propagator

Abstract

The scalar isovector meson propagator is studied in quenched QCD. For the lightest quark masses used, this propagator is dominated by a quenched chiral loop effect associated with the ${\eta }^{\prime }$-$\pi$ two-meson intermediate state. Both the time dependence and the pion mass dependence of the effect are well-described by quenched chiral perturbation theory.

Comments: 3 pages, 3 figures, Lat2001 Proceedings