Quark-antiquark confinement and nonlinear electrodynamics

Quark - Antiquark Bound

Asymmetric Quark/Antiquark Hadronization

We point out that the fragmentation of a strange quark into nucleons versus antinucleons is not necessarily identical Dp/s(z,Q ) 6= Dp/s(z,Q ), even though the perturbative contributions from gluon splitting and evolution are p ↔ p symmetric. The observation of such asymmetries in the hadronization of strange and other heavy quarks can provide insight into the nonperturbative mechanisms underly...

- quark - antiquark potential

We calculate the leading mass-suppressed two-loop contribution, proportional to αs/(mqr 2), to the potential of a heavy quark-antiquark system. This contribution originates in the nonabelian nature of quantum chromodynamics (QCD) and has no analogue in quantum electrodynamics (QED). For this purpose, we elaborate a technique based on the implementation of the threshold expansion within the effe...

Relation between quark-antiquark potential and quark-antiquark free energy in hadronic matter

In the high-temperature quark-gluon plasma and its subsequent hadronic matter created in a high-energy nucleus-nucleus collision, the quark-antiquark potential depends on the temperature. The temperature-dependent potential is expected to be derived from the free energy obtained in lattice gauge theory calculations. This requires one to study the relation between the quark-antiquark potential a...

Perturbative heavy quark-antiquark systems

In this review I cover recent developments concerning the construction of non-relativistic effective theories for perturbative heavy quark-antiquark systems and heavy quark mass definitions. I then discuss next-to-next-to-leading order results on quarkonium masses and decay, top quark pair production near threshold and QCD sum rules for Υ mesons. (November 1999, CERN-TH/99-355, hep-ph/9911490) ...