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We discuss lattice methods to obtain the derivatives of a lattice meson mass with respect to the bare sea and valence quark masses. Applications are made to quenched and dynamical fermion configurations. We find evidence for significant differences between quenched and dynamical fermion configurations. We discuss how to relate dependence on the bare lattice… (More)
Lattice QCD determinations appropriate to hadron spectroscopy are reviewed with emphasis on the glueball and hybrid meson states in the quenched approximation. Hybrids are discussed for heavy and for light quarks. The effects of sea quarks (un-quenching) are explored. Heavy-light systems are presented-particularly excited B mesons.
We present results of dynamical simulations of N f = 2 degenerate Wilson twisted mass quarks at maximal twist in the range of pseudo scalar masses 300 MeV m PS 550 MeV. Reaching such small masses was made possible owing to a recently developed variant of the HMC algorithm. The simulations are performed at one value of the lattice spacing a 0.1 fm. In order… (More)
We review lattice QCD results for glueballs (including a discussion of mixing with scalar mesons), hybrid mesons and exotic mesons (such as B s B s molecules).
We present the lattice gauge theory approach to evaluating non-perturbative hadronic interactions from first principles. We discuss applications to glueballs, inter-quark potentials , the running coupling constant, the light hadron spectrum and the pseudoscalar decay constant f P .
We present a study of the SU (3) glueball spectrum for all J P C values at lattice spacings down to a −1 = 3.73(6) GeV (β = 6.4) using lattices of size up to 32 4. We extend previous studies and show that the continuum limit has effectively been reached. The number of clearly identified J P C states has been substantially increased. There are no clear… (More)
We analyse the sum rules describing the action and energy in the colour fields around glueballs, torelons and static potentials.
The status of lattice determinations of quarkonia and hybrid meson spectra is presented and compared with experiment. Both quenched and unquenched results are discussed. Hybrid meson decays are considered. T his paper discusses the consequences from first principles of QCD for the heavy quark-antiquark bound states: quarkonia and hybrid mesons. This is… (More)
We evaluate properties of neutral mesons in N f = 2 dynamical simulations of TMQCD at maximal twist. The pion is explored-establishing the size of the isospin splitting (an order a 2 effect). We investigate the η ′ (the N f = 2 flavour singlet pseudoscalar meson) and neutral ρ and scalar mesons. We show that disconnected diagrams can be evaluated very… (More)
We discuss in detail the extraction of hadronic mixing strengths from lattice studies. We apply this to the mixing of a scalar glueball and a scalar meson in the quenched approximation. We also measure correlations appropriate for flavour-singlet scalar mesons using dynamical quark configurations from UKQCD. This enables us to compare the results from the… (More)