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We investigate the physics case for a dedicated trigger on a low mass,hadronic displaced vertex at the high luminosity LHC, relying on the CMS phaseII track trigger. We estimate the trigger efficiency with a simplifiedsimulation of the CMS track trigger and show that the L1 trigger rate from fakevertices, B meson decays and secondary interactions with the detector materialcan likely be brought down to the kHz level with a minimal set of cuts. Whileit would with any doubt be a severe experimental challenge to implement, weconclude that a displaced vertex trigger could open qualitatively new parameterspace for exotic Higgs decays, exotic B decays and even direct production oflight resonances. We parametrize the physics potential in terms of a singletscalar mixing with the Standard Model Higgs and an axion-like particle with acoupling to gluons, and review a number or relevant models motivated by thehierarchy and strong CP problems, dark matter and baryogenesis.

Probing naturally light singlets with a displaced vertex trigger