Double pomeron exchange at the CERN Intersecting Storage Rings and $Sp\bar{p}S$ Collider

Abstract

The CERN Intersecting Storage Rings, with [Formula: see text] from 22 GeV to 63 GeV and [Formula: see text], allowed the first observations of p + p → p + X + p with two leading protons (xF > 0.95) or two rapidity gaps Δy > 3. Studies of the central hadronic system (X) were made to search for glueballs, finding f0 and f2 resonances, and to advance our understanding of hadronic diffraction. I review the experiments, not including those at the Split Field Magnet (SFM) facility covered elsewhere in this volume. Some double pomeron exchange studies at the CERN [Formula: see text] Collider are also covered.