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For years, it has been believed that the main LHC detectors can onlyrestrictively play the role of a lifetime frontier experiment exploring theparameter space of long-lived particles (LLPs) -- hypothetical particles withtiny couplings to the Standard Model. This paper demonstrates that the LHCbexperiment may become a powerful lifetime frontier experiment if it uses thenew \texttt{Downstream} algorithm reconstructing tracks that do not let hits inthe LHCb vertex tracker. In particular, for many LLP scenarios, LHCb may be assensitive as the proposed experiments beyond main LHC detectors for various LLPmodels, including heavy neutral leptons, dark scalars, dark photons, andaxion-like particles.

LHCb potential to discover long-lived new physics particles with lifetimes above 100 ps