ar X iv : h ep - l at / 9 90 60 02 v 2 2 4 N ov 1 99 9 Exploring the π + – π + Interaction in Lattice QCD

ar X iv : h ep - l at / 9 90 60 02 v 1 1 J un 1 99 9 Exploring the π + – π + Interaction in Lattice QCD

ar X iv : h ep - l at / 9 90 60 01 v 1 1 J un 1 99 9 1 On the I = 2 channel π - π interaction in the chiral limit ∗

An approximate local potential for the residual π + – π + interaction is computed. We use an O(a 2) improved action on a coarse 9 3 × 13 lattice with a ≈ 0.4fm. The results present a continuation of previous work: Increasing the number of gauge configurations and quark propagators we attempt extrapolation of the π + – π + potential to the chiral limit.

ar X iv : h ep - p h / 99 11 24 6 v 1 4 N ov 1 99 9 1 Theoretical Summary of the HADRON 99 conference

The Constituent Quark Model has provided a remarkable description of the experimentally observed hadron spectrum but still has no firm theoretical basis. Attempts to provide a QCD justification discussed at Hadron99 include QCD Sum Rules, instantons, relativistic potential models and the lattice. Phenomenological analyses to clarify outstanding problems like the nature of the scalar and pseudos...

ar X iv : h ep - l at / 9 91 10 02 v 1 2 N ov 1 99 9 1 The finite temperature QCD phase transition with domain wall fermions .

Results from the Columbia lattice group study of the QCD finite temperature phase transition with dynamical domain wall fermions on 16 × 4 lattices are presented. These results include an investigation of the U(1) axial symmetry breaking above but close to the transition, the use of zero temperature calculations that set the scale at the transition and preliminary measurements close to the tran...

ar X iv : h ep - l at / 9 31 20 16 v 1 3 D ec 1 99 3 1 Lattice QCD Calculation of Hadron Scattering Lengths ∗

Method of calculating hadron multi-point functions and disconnected quark loop contributions which are not readily accessible through conventional techniques is proposed. Results are reported for π-π, π-N and N-N scattering lengths and the flavor singlet-non singlet meson mass splitting estimated in quenched QCD.