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Future electron-proton collider proposals like the LHeC or the FCC-eh cansupply 1/ab of collisions with a center-of-mass energy in the TeV range, whilemaintaining a clean experimental environment more commonly associated withlepton colliders. We point out that this makes electron-proton collidersideally suited to probe BSM signatures with final states that look like"hadronic noise" in the high-energy, pile-up-rich environment of hadroncolliders. We focus on the generic vector boson fusion production mechanism,which is available for all BSM particles with electroweak charges at massscales far above the reach of most lepton colliders. This is in contrast toprevious BSM studies at these machines, which focused on BSM processes withlarge production rates from the asymmetric initial state. We propose to exploitthe unique experimental environment in the search for long-lived particlesignals arising from Higgsinos or exotic Higgs decays. At electron-protoncolliders, the soft decay products of long-lived Higgsinos can be explicitlyreconstructed ("displaced single pion"), and very short lifetimes can beprobed. We find that electron-proton colliders can explore significant regionsof BSM parameter space inaccessible to other collider searches, with importantimplications for the design of such machines.

New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders