name

ALAN C. IRVING

refid

6693

email

aci@liverpool.ac.uk

title

Effects of non-perturbatively-improved dynamical fermions in UKQCD simulations.

collaboration

UKQCD Collaboration

abstract

We present results for the static inter-quark potential, scalar glueball,
light hadron spectrum and topological susceptibility using a
nonperturbativeley improved action on a lattice volume of $16^3\times 32$ where
the bare gauge coupling and bare dynamical quark mass have been chosen to
maintain a fixed physical lattice spacing and volume (1.71 fm). By comparing
measurements from these matched ensembles, including quenched ones, we study
the effects of partial unquenching due to two flavours of dynamical
quarks. With the greater control over residual lattice spacing effects which
these methods affords, we find some evidence of charge screening and some minor
effects on the light hadron spectrum over the range of quark masses studied
($m_{\pi}/m_{\rho}\ge0.584$). More substantial differences between quenched
and unquenched simulations have been observed in measurements of topological
quantities.

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