1. Evidences from exp. data for an important role of MB↔MMB & MMB↔MMB processes
CLAS data on yields of various meson
electroproduction channels (Q2<4.0 GeV2)
Cross sections of exclusive Np reactions
W (GeV)
Np/Npp channels are strongly coupled by FSI. They affect
all excvlusive meson production channels
Np/Npp channels are major contributors to photo
electro and hadro production

2. MB↔ MMB & MMB↔ MMB processes in the EBAC-DCC approach
the EBAC-DCC model for the first time provided explicit description of these processes, employing MB-diagrams derived from effective Lagrangians
model consistently accounts for restrictions imposed by unitarity
These advantages are important for N* parameter extraction, in particular, from multi- meson (photo) electroproduction channels.
Analysis of the CLAS data on Np , Npp,Nh, KY (photo) electroproduction off protons within the framework of the EBAC-DCC approach is needed for full access to COMPLEX N* electrocouplings and hadr. parameters of various excited proton states at Q2<5.0 GeV2
A.Matsuyama et al., Phys. Rept. 439, 193 (2007)
N.Suzuki et al., Phys. Rev. C82, (2010)

3. Npp electroproduction mechanisms determined from the CLAS data analysis within the framework of JM meson-baryon model
differential cross sections/amplitudes for isobar channels:
A joint Hall B-EBAC effort is being made to
use these results to improve reaction models and extend/interpret within EBAC-DCC model the information on N* parameters extracted by Hall B in independent analyses of major Np and Npp channels
p-D++
p+D0
and for direct Npp production are available.
will be available soon for:
rp, p+D13(1520), p+F15(1685), p-P33(1600)
isobar channels
W=1.51 GeV Q2=0.43 GeV2
V.I.Mokeev et al., Phys. Rev. C80, (2009)