Quark mass function from a one-gluon-exchange-type interaction in Minkowski space

D̄N interaction from meson-exchange and quark-gluon dynamics

We investigate the D̄N interaction at low energies using a meson-exchange model supplemented with a short-distance contribution from one-gluon-exchange. The model is developed in close analogy to the meson-exchange KN interaction of the Jülich group utilizing SU(4) symmetry constraints. The main ingredients of the interaction are provided by vector meson (ρ, ω) exchange and higher-order box diag...

Three-Quark Bethe-Salpeter Vertex Function Under Pairwise Gluon-Exchange-Like Interaction : Application To n-p Mass Difference

A qqq BSE formalism based on an input 4-fermion Lagrangian of ‘current’ u, d quarks interacting pairwise via a gluon-exchange-like propagator in its nonperturbative regime, is employed for the construction of a relativistic qqq-wave function under the Covariant Instantaneity Ansatz (CIA). The chiral invariance of the input Lagrangian is automatically ensured by the vector character of the gluon...

Superconductivity from perturbative one-gluon exchange in high density quark matter

We study color superconductivity in QCD at asymptotically large chemical potential. In this limit, pairing is dominated by perturbative one-gluon exchange. We derive the Eliashberg equation for the pairing gap and solve this equation numerically. Taking into account both magnetic and electric gluon exchanges, we find ∆ ∼ g exp(−c/g) with c = 3π/ √ 2, verifying a recent result by Son. For chemic...

Quark and Gluon Distributions in Coordinate Space †

In coordinate space, quark and gluon distributions of the nucleon are defined as correlation functions involving two field operators separated by a light-cone distance y = 2l. We study the nuclear modifications of these distributions. The largest effect is a strong depletion of parton distributions (shadowing) at large longitudinal distances, which starts for all parton species at l = 2 fm, i.e...

Mass effects in the quark-gluon decays