ar X iv : h ep - p h / 03 08 31 8 v 1 2 9 A ug 2 00 3 On the structure of the scalar and D mesons

ar X iv : h ep - p h / 06 08 21 3 v 1 1 8 A ug 2 00 6 Properties of D - Mesons from QCD Sum Rules with an improved spectral function

ar X iv : h ep - p h / 03 08 29 1 v 1 2 8 A ug 2 00 3 Scalar Particles in Lattice QCD 1 SCALAR Collaboration

We report a project to study scalar particles by lattice QCD simulations. After a brief introduction of the current situation of lattice study of the sigma meson, we describe our numerical simulations of scalar mesons, σ and κ. We observe a low sigma mass, m π < m σ ≤ m ρ , for which the disconnected diagram plays an important role. For the kappa meson, we obtain higher mass than the experiment...

ar X iv : h ep - p h / 03 07 03 8 v 1 2 J ul 2 00 3 1 Scalar meson exchange in Φ → P 0 P 0 γ decays ∗

ar X iv : h ep - p h / 03 08 09 9 v 1 8 A ug 2 00 3 The “ forbidden ” decays of Hybrid mesons to πρ can be large

The " forbidden " decays of Hybrid mesons to πρ can be large. Abstract The observation of π1(1600) → πρ is shown in the flux-tube model to be compatible with this state being a hybrid meson with branching ratio to this channel ∼ 10 − 25%. This forces the hybrid π(∼ 1800) to have a width to πρ ∼ 100-300 MeV, which implies a novel interpretation of data. The πρ widths of other hybrids are related...

ar X iv : h ep - p h / 05 08 14 2 v 1 1 1 A ug 2 00 5 Nature of the light scalar mesons

Despite the apparent simplicity of meson spectroscopy, light scalar mesons cannot be accommodated in the usual q ¯ q structure. We study the description of the scalar mesons below 2 GeV in terms of the mixing of a chiral nonet of tetraquarks with conventional q ¯ q states. A strong diquark-antidiquark component is found for several states. The consideration of a glueball as dictated by quenched...