Hadronic properties of the S_{11}(1535) studied by electroproduction off   the deuteron
  Properties of excited baryonic states are investigated in the context of electroproduction of baryon resonances off the deuteron. In particular, the hadronic radii and the compositeness of baryon resonances are studied for kinematic situations in which their hadronic reinteraction is the dominant contribution. Specifically, we study the reaction $d(e,e'S_{11})N$ at $Q^2\ge 1 GeV^2$ for kinematics in which the produced hadronic state reinteracts predominantly with the spectator nucleon. A comparison of constituent quark model and effective chiral Lagrangian calculations of the $S_{11}$ shows substantial sensitivity to the structure of the produced resonance. 
Leonid Frankfurt (Tel Aviv U.), Mikkel Johnson (LANL), Misak Sargsian   (UW, Seattle), Mark Strikman (Penn. State U.), Wolfr...