Workshop on the Physics of Excited Nucleon – NSTAR2009, Beijing, April 19 – 22, 2009

 

Invited plenary talk

 

Invited parallel talk

 

Oral contribution

 

Authors: V.Vegna on behakf of the GRAAL collaboration

Title: Latest results from GRAAL collaboration

Keywords: meson photproduction, beam polarization asymmetry

Abstract:
Latest results on beam asymmetry measurements for pseudoscalar meson photoproduction on quasi-free neutron are presented. It is shown that important constraints on PWA of pion photoproduction ractions are provided by the new data set. Single and double polarization observables on K+ production from the proton are also extracted and are proved to be important to understand the role of "missing resonances" in the reaction mechanism. A short overview of some of the most important results from the GRAAL collaboration due to the intense and original work of Dr. Eid Hourany is presented to honor his memory.