Helicity-Asymmetries in Double-Charged-Pion Photoproduction on the Proton
Steffen Strauch
The George Washington University

Helicity asymmetries for the two-pion-photoproduction reaction on the proton have been studied for the first time in the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using circularly polarized tagged photons on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics of the reaction. The data are compared to various phenomenological model calculations.