Speaker: Hiroyuki Kamano (Jefferson Lab)

Title: Study of Excited Nucleon States at EBAC : Status and Plans

Abstract:
Recent experimental activities at electron-beam facilities have brought 
new light to the study of excited nucleon (N*) states. Those facilities 
provide a considerable amount of precise data of the meson photo- and 
electro-production reactions on the nucleon target, and open opportunity 
to make quantitative investigations of the N* structure. Against the 
background of those experimental progress, continuous effort to extract 
N* properties from those meson production data is being made in Excited 
Baryon Analysis Center (EBAC) at Jefferson Lab. The analysis is pursued 
with a unitary dynamical coupled-channels approach, in which the most 
relevant unitarity cuts below W = 2GeV, pi N, eta N, and pi pi N, are 
taken into account in solving coupled-channels equations. In this seminar 
we present current status of EBAC's activities and future plans, particularly 
focusing on our recent works about extraction of the N* pole positions and 
N-N* electromagnetic transition form factors.