Download Epub Browse Figures Versions Notes Abstract The squared momentum transfer spectra of 𝜂η and 𝜂0η0, produced in high-energy photon–proton (𝛾𝑝γp) →𝜂(𝜂0)+𝑝→η(η0)+p processes in electron–proton (𝑒𝑝ep) collisions performed at CEBAF, NINA, CEA, SLAC...