1. Unquenching the Quark-Antiquark Green’s Function.
- Author
-
Watson, P. and Cassing, W.
- Subjects
- *
QUARKS , *BETHE-Salpeter equation , *PARTICLES (Nuclear physics) , *QUANTUM field theory , *NUCLEAR physics , *QUANTUM theory - Abstract
We propose a nonperturbative resummation scheme for the four-point connected quark-antiquark Green’s functionG4 that shows how the Bethe-Salpeter equation may be “unquenched” with respect to quark-antiquark loops. This mechanism allows to dynamically account for hadronic meson decays and multiquark structures whilst respecting the underlying symmetries. An initial approximation to the four-point Schwinger-Dyson equation - suitable for phenomenological application - is examined numerically in a couple of aspects. It is demonstrated that this approximation explicitly maintains the correct asymptotic limits and contains the physical resonance structures in the near timelike region in the quark-antiquark channel. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF