On the glueball spectrum in O(a)-improved lattice QCD

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dc.creatorUKQCD Collaboration
dc.creatorHart, A.
dc.creatorTeper, M.
dc.date2001-08-16
dc.date2001-12-21
dc.date.accessioned2026-07-07T10:32:29Z
dc.date.available2026-07-07T10:32:29Z
dc.descriptionWe calculate the light `glueball' mass spectrum in N_f=2 lattice QCD using a fermion action that is non-perturbatively O(a) improved. We work at lattice spacings a ~0.1 fm and with quark masses that range down to about half the strange quark mass. We find the statistical errors to be moderate and under control on relatively small ensembles. We compare our mass spectrum to that of quenched QCD at the same value of a. Whilst the tensor mass is the same (within errors), the scalar mass is significantly smaller in the dynamical lattice theory, by a factor of ~(0.84 +/- 0.03). We discuss what the observed m_q dependence of this suppression tells us about the dynamics of glueballs in QCD. We also calculate the masses of flux tubes that wind around the spatial torus, and extract the string tension from these. As we decrease the quark mass we see a small but growing vacuum expectation value for the corresponding flux tube operators. This provides clear evidence for `string breaking' and for the (expected) breaking of the associated gauge centre symmetry by sea quarks.
dc.description33pp LaTeX. Version to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-lat/0108022
dc.identifierhttp://arxiv.org/abs/hep-lat/0108022
dc.identifierPhys.Rev.D65:034502,2002
dc.identifierdoi:10.1103/PhysRevD.65.034502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178773
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleOn the glueball spectrum in O(a)-improved lattice QCD
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