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 |VℓN|2 are small, for 1 GeV≲MN≲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.

Source: UCL Discovery (University College London)

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

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: green

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

Awards: G1286510704, South-East Particle Theory Alliance (SEPTA), 2023-26, UCL Node, G8145856165, South-Eastern Particle Theory Alliance Sussex - RHUL - UCL 2020-2023 - UCL Node

OpenAlex ID: W7111451137