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Long-lived particles are fundamentally motivated and appear in all beyond the Standard Model theoretical constructs that address the key issues not included in the Standard Model such as Dark Matter, Baryon Asymmetry, Neutrino Masses and the Heirarchy problem. Big Bang Nucleosynthesis (BBN) imposes an upper limit of 0.1 s on the allowable long-lived particle lifetime. Very large backgrounds limit the lifetime reach of current LHC detectors. This talk describes recent developments of the large area MATHUSLA detector proposed
G. Cavoto, A. Policicchio