Multi-gluon field approach of QCD

TL;DR

This paper models 2-gluon decay processes in QCD using Monte-Carlo simulations, deriving glueball sizes, binding potentials, and nucleon structure, aligning with experimental data and lattice results.

Contribution

It introduces a self-consistent approach to determine 2-gluon densities and potentials, connecting glueball properties with nucleon structure within a unified framework.

Findings

Derived 2-gluon densities for various glueball sizes.

Obtained binding potentials consistent with lattice confinement.

Predicted excitation spectra matching experimental observations.

Abstract

The decay of 2-gluon colour singlets in quarks: 2g --> q-qbar +2q-2qbar has been simulated with the Monte-Carlo method, taking into account an effective 1-gluon exchange interaction between the emitted quarks, which was folded with a 2-gluon density determined self-consistently. 2-gluon densities were found with different radii, which correspond to 0^{++} glueballs of the size of light q-qbar, s-sbar, c-cbar, b-bbar, and heavier q-qbar systems. Binding potentials between the two gluons have been deduced, which are consistent with the confinement potential from lattice results. However, self-consistency for the deduction of 2-gluon densities requires massless (or very light) quarks for all flavours. The masses are given by the binding energies of quarks and gluons, yielding excitation spectra of 0^{++} glueballs and Phi, J/Psi, and Upsilon states consistent with observation. The sum of q-q potentials yields a strong coupling alpha_s consistent with the available data up to large momenta. The nucleon is described by a gluonium state coupled to 3 valence quarks, yielding ground state and radial excitations consistent with experiment. Finally, we discuss the compressibility of the nucleon and relate it to that of nuclear matter.