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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 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)
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 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)
Recent theoretical models suggest that perceived racism acts as a stressor for African Americans and may be associated with a variety of negative psychological consequences, notably paranoia. Paranoia among African Americans is believed to reflect the lower end of the paranoia continuum based on experiences with racism. Thus, it may be beneficial to measure(More)