π0η andπ0η’ mixing and the reaction d+d→π0+4He

Abstract
The isospin-forbidden reaction d+d→π0+4He provides a very good test of the validity of charge symmetry. The forward differential cross section dσ/dΩ is estimated to be ≊0.12 pb/sr at a deuteron laboratory energy of 1.95 GeV. The assumed reaction mechanism is virtual η and η’ production and π0η and π0η’ mixing.