Speaker
Dr
Alexander Osipov
(JINR)
Description
An extended Nambu-Jona-Lasinio model with chiral group $U(2)\times U(2)$ and spin-0 and spin-1 four quark interactions is used to develop the gauge covariant approach to the diagonalization of the $\pi - a_1$ mixing in the presence of electroweak forces. This allows for manifestly gauge covariant description of both the non-anomalous and anomalous parts of the effective meson Lagrangian. It is shown that in the non-anomalous sector the theory is equivalent to the standard non-covariant approach. However, the theory differs from the standard one in the anomalous sector. Some straightforward applications are considered.
Authors
Dr
Alexander Osipov
(JINR)
Dr
Brigitte Hiller
(Coimbra University)
Dr
Pengming Zhang
(Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China)
