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

Wei Liu; Frank F. Deppisch; Zixiang Chen

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arXiv · 2312.11165

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

Wei Liu·Frank F. Deppisch·Zixiang Chen

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Abstract

We discuss the potential of using long-lived particle (LLP) searches for right-handed neutrinos (RHNs) to test resonant leptogenesis and the seesaw mechanism. This is challenging if only RHNs are added to the Standard Model (SM), as naturally the active-sterile mixing strengths $|V_{\ell N}|^2$ are small, for 1 GeV $\lesssim M_N \lesssim 1000$ GeV. Instead, we consider the minimal $B-L$ gauge model, where a $Z^\prime$ gauge boson couples to fermions including the RHNs. During leptogenesis, this gauge coupling introduces scattering processes that washout the $B-L$ asymmetry. At colliders, it can lead to abundant production of RHNs which allows probing the associated seesaw mechanism using LLP searches. We find that LLP searches at the FCC-hh can test leptogenesis and the seesaw mechanism simultaneously, and probe the active-sterile mixing at or below the seesaw floor.

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Wei Liu, Frank F. Deppisch, Zixiang Chen. 2023-12-18. Testing Leptogenesis and Seesaw using Long-lived Particle Searches in the $B-L$ Model. https://arxiv.org/abs/2312.11165

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