Glueballs and topology with O(a)-improved lattice QCD
Abstract
We present evidence for unquenching effects in Nf=2, 163 32 ensembles by comparing with `equivalent' quenched data at r0~5.0. A (small) VEV for torelons signals (weak) string breaking. A 15-20 % reduction in the scalar glueball mass relative to quenched is argued to be (in part at least) a discretisation effect. We find a chiral suppression of the topological susceptibility consistent with expectations, and agreement between fermionic and gluonic methods for measuring the topological charge.
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