Towards an effective field theory for vector mesons
Abstract
The assumption that vector mesons dominate the interactions of hadrons with electromagnetism (vectormeson dominance  VMD) provides an important phenomenological concept. On the other hand, a clear microscopic derivation is still missing and there are cases where VMD drastically fails, e.g. for the omega transition form factor. In principle, effective field theories with their systematic expansion and power counting could provide a tool to assess the validity of VMD and more generally to describe the interactions of vector mesons at low energies. Though the systematic development is still in an infant stage we present here a Lagrangian for light pseudoscalar and vector mesons which is inspired by ideas from effective field theories. The Lagrangian is used to calculate electromagnetic meson form factors. It turns out that one can reproduce both the successes of VMD concerning the pion form factors and the deviations from VMD concerning the omega transition form factor.
 Publication:

Proceedings of the 50th International Winter Meeting on Nuclear Physics (Bormio2012). 2327 January 2012. Bormio
 Pub Date:
 2012
 arXiv:
 arXiv:1206.2253
 Bibcode:
 2012wmnp.confE..24L
 Keywords:

 High Energy Physics  Phenomenology;
 Nuclear Theory
 EPrint:
 Talk presented at the 50th International Winter Meeting on Nuclear Physics, 2327 January 2012, Bormio (Italy)