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Glueballs and topology with O(a)-improved lattice QCD

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arxiv hep-lat/0110167 v1 pith:4PA62KXM submitted 2001-10-19 hep-lat

Glueballs and topology with O(a)-improved lattice QCD

classification hep-lat
keywords quenchedtopologicalagreementarguedbreakingchargechiralcomparing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present evidence for unquenching effects in N_f=2, 16^3 32 ensembles by comparing with `equivalent' quenched data at r_0~5.0. 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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