Calculation of the N to Delta electromagnetic transition matrix element
  We present results on the ratio of electric quadrupole to magnetic dipole amplitudes, $R_{EM}={\cal G}_{E2}/{\cal G}_{M1}$, for the transition $\gamma N to \Delta$ from lattice QCD. We consider both the quenched and the 2-flavor theory. 
C. Alexandrou (Univ. of Cyprus), Ph. de Forcrand (CERN and ETH   Zurich), Th. Lippert (Univ. of Wuppertal), H. Neff (Univ. o...