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We study medium modifications of the dilepton mass spectrum in coherentphoto- and electroproduction of the Rho(1S)- and Rhoprim(2S)-meson resonanceson nuclear targets. The analysis is performed within the coupled Rho,Rhoprim... channel formalism in which nuclear modifications derive from theoff-diagonal rescatterings. We find that the effect of off-diagonalrescatterings on the shape of the dilepton mass spectrum in the Rho(1S)-mesonmass region is only marginal but is very important in the Rhoprim mass region.The main off-diagonal contribution in the Rhoprim mass region comes from thesequential mechanism gamma* -> Rho -> Rhoprim(2S), which dominates theRhoprim(2S) production for heavy nuclei.  Our results show also that in the Rhoprim(2S) mass region there is aconsiderable effect of the interference of the Breit-Wigner tail ofRho(1S)-meson with the Rhoprim-meson.Comment: 18 pages, 9 figure

Nuclear-medium modification of the ρ0(1S) and ρ′(2S) mesons in coherent photo-and electroproduction: Coupled-channel analysis