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We discuss the potential of using long-lived particle (LLP) searches forright-handed neutrinos (RHNs) to test resonant leptogenesis and the seesawmechanism. This is challenging if only RHNs are added to the Standard Model(SM), as naturally the active-sterile mixing strength are small, for 100 GeV$\lesssim M_N \lesssim 400$ GeV. Instead, we consider the $B-L$ gauge model,where a $Z^\prime$ gauge boson couples to fermions including the RHNs. Duringleptogenesis, this gauge coupling introduces scattering processes that washoutthe $B-L$ asymmetry. At colliders, it can lead to abundant production of RHNswhich can probe the seesaw using LLP searches. We discuss the results for threebenchmark scenarios, and find that LLP searches at the FCC-hh can testleptogenesis and seesaw mechanism at the same time, and probe theactive-sterile mixings $|V_{\ell N}|^2$ at or below the seesaw floor.

Testing Leptogenesis and Seesaw using Long-lived Particle Searches in the $B-L$ Model