Polarization Observables from two-pion and ρ meson photoproduction on polarized HD target at JLab

Abstract

First results on single and double polarization observables on polarized neutrons have been obtained using the polarized HD target and the CLAS detectors at the Hall-B of the Thomas Jefferson Laboratory. The author reports on her studies of the classification of polarization observables, neutron detector calibration and HD target set-up. Data analysis has been optimized for the gamma+n -> pi+ pi- n events selection on quasi-free target . Boosted-decision-tree techniques have been studied and applied for the selection of final gamma+n -> rho + n -> pi+ pi- n events. First results on polarization observables are reported.