Speaker
Dr
Elmar P. Biernat
(Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
Description
We present results for the electromagnetic form factors of the $\rho$ meson obtained within point-form relativistic quantum mechanics. In our formalism for the calculation of the meson current we treat elastic electron-meson scattering as a Poincaré-invariant coupled-channel problem for a Bakamjian-Thomas mass operator. From the resulting invariant one-photon-exchange amplitude we extract the meson current. The well-known violation of cluster separability in the Bakamjian-Thomas framework causes the appearance of unphysical contributions in the current, which, however, can be separated unambiguously from the physical ones such that we obtain a current with all required properties.
Author
Dr
Elmar P. Biernat
(Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
Co-author
Prof.
Wolfgang Schweiger
(Inst. fuer Physik, Karl-Franzens-Universitaet Graz)
