Bonn 2010 – wissenschaftliches Programm
HK 4.4: Vortrag
Montag, 15. März 2010, 18:00–18:15, HG III
Pion form factor in chiral EFT with explicit vector mesons — Dalibor Djukanovic1, •Jambul Gegelia1,2, Arne Keller1, and Stefan Scherer1 — 1Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany — 2High Energy Physics Institute of TSU, 0186 Tbilisi, Georgia
Electromagnetic form factor of the Pion is calculated in the framework of chiral effective field theory with vector mesons included as dynamical degrees of freedom. Results are given for the time-like region up to q2∼ 1 GeV2. To construct an effective field theory with a consistent power counting the complex-mass-renormalization scheme is applied. This can be interpreted as the on-mass-shell renormalization scheme for unstable particles. Reasonably good description of the data is obtained already at next-to-leading order within the given approach.