Källen-Lehman Representation and the Gluon Propagator
Abstract
Description
We exploit the Kallen-Lehman representation of the two-point Green function to prove that the gluon propagator cannot go to zero in the infrared limit. We are able to derive also the functional form of it. This means that current results on the lattice can be used to derive the scalar glueball spectrum to be compared both with experiments and different aimed lattice computations.
4 pages, no figure. Numerical comparison with Aguilar and Natale results (hep-ph/0408254) is given showing exceptionally good agreement
4 pages, no figure. Numerical comparison with Aguilar and Natale results (hep-ph/0408254) is given showing exceptionally good agreement