  Central exclusive production at hadron colliders is characterised by the
hadronic state produced at or close to midrapidity, and by the two forward
scattered protons, or remnants thereof. No particles are produced between the
midrapidity system and the forward going beam particles, and such events can
hence be identified experimentally by a double-gap topology. At LHC energies,
central exclusive production in proton-proton collisions is dominated by
pomeron-pomeron fusion. The models to describe such reactions are reviewed, and
the ongoing efforts in the ALICE Collaboration to analyse double-gap events
taken in Run 2 at the LHC are presented.
