Measurement of single- and double-polarization observables in the photoproduction of π+π− meson pairs off the proton using CLAS at Jefferson Laboratory

The photoproduction of n+n-meson pairs off the proton has been studied in the reaction yp -> pn+n-using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For