Orateur
Description
We will show how to obtain a closed expression for the
the calculation of the pion decay constant in the chiral case.
The expression is obtained by using the Curci-Ferrari model which
includes massive gluons. This model also allows to find an infrared safe
trajectory of the renormalisation group. With
which the results of the numerical simulations can be reproduced with good accuracy ussing perturbation theory. This leads to the interpretation that the
development parameter associated with the ghost-gluon coupling constant is a small parameter.
This small parameter allows for a better understanding of which diagrams has to be considered when calculating, for example, the pion decay constant. The numerical solution of the expression gives the region of gluon masses that well reproduce the pion decay constant.
