DIFFERENTIAL CROSS SECTION AND VECTOR ANALYZING POWER OF THE p_(pol)p → {pp}_sπ~0 REACTION AT 353-700 MeV

摘要

The reaction p_(pol)P → {pp}_sπ~0 was studied with the ANKE spectrometer at COSY-Juelich using a polarized beam with the energies of 353, 500, 550, and 700 MeV. The proton pairs {pp}_s were detected at low excitation energy E_(pp) ＜ 3 MeV, where S wave dominates. The angular dependences of vector analyzing power A_y and differential cross section dσ/dΩ of the reaction have been obtained for the most of the angular range at 353 MeV and forward angles at the higher beam energies. The partial wave amplitude analysis, done with the 353 MeV results, is important for Chiral Perturbation Theory (CPT) tests at this energy. The data at higher energies detalize the energy dependence of dσ/dΩ(0°) obtained earlier. It allows one to learn about the dynamics of the Δ(1232) resonance excitation in the two-nucleon systems.