A study of the reaction p + p → p + p + X at ISR energies

Abstract We have performed an experiment to investigate the reaction p + p → p 1 + p 2 + X at the CERN Intersecting Storage Rings (ISR). The dependence of the cross-section on the mass and rapidity of the system X, and on the momentum transfer squared t 1 , t 2 to the outgoing protons is studied. We observe signals for the production of ϱ , ω , f, and A 2 mesons in the missing-mass spectra, and conclusions are made about the contribution of double-Pomeron exchange.