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Visible signals from the decays of light long-lived hidden sector particleshave been extensively searched for at beam dump, fixed-target, and colliderexperiments. If such hidden sectors couple to the Standard Model throughmediators heavier than $\sim 10$ GeV, their production at low-energyaccelerators is kinematically suppressed, leaving open significant pockets ofviable parameter space. We investigate this scenario in models of inelasticdark matter, which give rise to visible signals at various existing andproposed LHC experiments, such as ATLAS, CMS, LHCb, CODEX-b, FASER, andMATHUSLA. These experiments can leverage the large center of mass energy of theLHC to produce GeV-scale dark matter from the decays of dark photons in thecosmologically motivated mass range of $\sim 1-100$ GeV. We also provide adetailed calculation of the radiative dark matter-nucleon/electron elasticscattering cross section, which is relevant for estimating rates at directdetection experiments.

Inelastic Dark Matter at the LHC Lifetime Frontier: ATLAS, CMS, LHCb, CODEX-b, FASER, and MATHUSLA