229,289 research outputs found
Hadronic decays
Hadronic decays and transitions are a key ingredient of hadronic physics. I
discuss how hadronic decays can be explored in lattice gauge theory and review
studies undertaken. I also discuss the impact of decays on masses and how
lattice studies can explore the nature of a hadronic state: namely whether it
is a molecular or quark-antiquark state. A brief discussion of lattice
exploration of pentaquark states is presented.Comment: 14 pages, plenary talk at Lattice 2005, Dublin, July 25-3
The eta and eta' mesons from lattice QCD
Lattice QCD allows a first-principles study of QCD with the freedom to vary
the number and masses of the quarks. I present results on the flavour singlet
correlations (this illuminates OZI violating effects) for mesons. Concentrating
on the pseudoscalar mesons, the flavour singlet mass splitting (,
mass splitting) appears naturally.
I also present results on an investigation of decay constants for the
and () and discuss which quantities may be accessible in
future lattice studies.
The Witten-Veneziano approach can also be explored by determining the
quenched topological susceptibility on a lattice.Comment: 13 pages, LATEX, 3 ps figures, Proc. WORKSHOP ON ETA PHYSICS,
Uppsala, October 22-27, 200
Lattice sum rules for the colour fields
We analyse the sum rules describing the action and energy in the colour
fields around glueballs, torelons and static potentials.Comment: 9 pages LATEX, (typos corrected, to appear in Phys Rev D
The Mass Spectrum of a Static Adjoint Particle
The bound states of fermions in the adjoint representation are of interest in
supersymmetric models. We investigate the energy spectrum of the simplest --
the gluino-gluon bound states -- on several lattices in the quenched
approximation. We use a static approximation for the gluino propagator. We find
continuum limits of the splitting between the few lowest states, with the
energy difference between the two lowest states of MeV.Comment: 3 pages, Latex, to appear Lattice 97 proceding
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