On construction of anticliques for non-commutative operator graphs

In this paper anticliques for non-commutative operator graphs generated by the generalized Pauli matrices are constructed. It is shown that application of entangled states for the construction of code space K allows one to substantially increase the dimension of a non-commutative operator graph for which the projection on K is an anticlique.Comment: 11 pages, typos are correcte

Phenomenological analysis of the CLAS data on double charged pion photo and electro- production

First comprehensive data on the evolution of nucleon resonance photocouplings with photon virtuality Q^2 are presented for excited proton states in the mass range from 1.4 to 2.0 GeV. N^* photocouplings were determined in phenomenological analysis of CLAS data on 2 pi photo and electroproduction within the framework of the JLAB-MSU phenomenological model.Comment: 10 pages, 7 figures (encapsulated postscript

Results from the N* program at JLab

We discuss the results on the fundamental degrees of freedom underlying the nucleon excitation spectrum and how they evolve as the resonance transitions are investigated with increasingly better space-time resolution of the electromagnetic probe. The search for undiscovered but predicted states continues to be pursued with a vigorous experimental program. While recent data from JLab and elsewhere provide intriguing hints of new states, final conclusions will have to wait for the results of the broad experimental effort currently underway with CLAS, and subsequent analyses involving the EBAC at JLab.Comment: Chapter in the book "A decade of Physics at Jefferson Lab", to be published in Journal of Physics: Conference Serie