Gunnar S. Bali

QCD forces and heavy quark bound states

Abstract The present knowledge of QCD confining forces between static test charges is summarised, with an emphasis on lattice results. Recent developments in relating QCD potentials to quarkonium properties by use of effective field theory methods are presented. The validity of non-relativistic QCD and the adiabatic approximation with respect to heavy quark bound states is explored. Besides the static potential and relativistic correction terms, the spectra of glueballs and gluinoballs, hybrid excitations of the QCD flux tube between fundamental colour sources, potentials between charges in various representations of the SU (3) gauge group, and multi-particle interactions are discussed. Some implications for quarkonia systems and quark–gluon hybrid mesons are drawn.

Are there short distance non-perturbative contributions to the QCD static potential?

Abstract We find that perturbation theory fails to describe the short range static potential as obtained from quenched lattice simulations, at least for source separations r >(6 GeV) −1 . The difference between the non-perturbatively determined potential and perturbation theory at short distance is well parameterised by a linear term with a slope of approximately 1.2 GeV 2 , that is significantly bigger than the string tension, σ ≈0.21 GeV 2 .

A Lattice potential investigation of quark mass and volume dependence of the Upsilon spectrum

We investigate bottomonia splittings by solving a Schrodinger-Pauli-type equation with parametrizations of QCD potentials around those that have been determined previously in lattice simulations. This is done both in the continuum and on finite lattices with resolutions ranging from

Glueballs and string breaking from full QCD

a=0.2mathrm{fm}

Casimir scaling or flux counting

down to

Critical dynamics of the hybrid Monte Carlo algorithm

a=0.025mathrm{fm}

Spin dependent potentials from SU(2) gauge theory

and an extent of up to 12 fm or

The Mechanism of quark confinement

{144}^{3}

OVERVIEW FROM LATTICE QCD

lattice points. We find a strong dependence of some splittings, in particular the

Confining Forces and String Formation from the Lattice

2Sensuremath{-}1S