Work

Testing leptogenesis and seesaw in the B − L model using long-lived particle searches

Year: 2024

Type: article

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, as naturally the active-sterile mixing strengths | V ℓ N | 2 are small, for 1 GeV ≲ M N ≲ 1000 GeV . Instead, we consider the minimal B − L gauge model, where a Z ′ 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. Published by the American Physical Society 2024

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.110.035017

Authors: Wei Liu, Frank F. Deppisch, Zixiang Chen

Institutions: Nanjing University of Science and Technology, University College London

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: UK Research and Innovation, National Natural Science Foundation of China, Science and Technology Facilities Council