Speaker
Description
A quark-model treatment of hadron decays suggests that the creation of a constituent quark-antiquark pair occurs in a spin-triplet p-wave scalar configuration, 3P0 in spectroscopic Russell-Saunders notation. This chiral-symmetry breaking vertex has long been known to have to be nonperturbative since the fundamental underlying theory, chromodynamics, is to a good approximation chirally symmetric. Thus, such production vertex has to arise simultaneously to the constituent quark mass.
The last decade has brought detailed lattice data for the primitive vertices of QCD in Landau gauge. A practical use of this data has been to constrain Dyson-Schwinger parametrizations of the most elementary QCD Green's functions, that are now reasonably well known.
With this knowledge of the underlying theory in the infrared regime we attempt to connect the Landau gauge formalism and the constituent quark model to ascertain the relative size of the various possible structures in the quark-antiquark production vertex, including the postulated 3P0 quark-model piece.
