The present and future status of heavy neutral leptons

Abdullahi, Asli M; Barham Alzás, Pablo; Batell, Brian; Beacham, James; Boyarsky, Alexey; Carbajal, Saneli; Chatterjee, Animesh; Crespo-Anadón, José I; Deppisch, Frank F; De Roeck, Albert; Drewes, Marco; Martin Gago, Alberto; Gonzalez Suarez, Rebeca; Goudzovski, Evgueni; Hatzikoutelis, Athanasios; Hernandez-Garcia, Josu; Hostert, Matheus; Hufnagel, Marco; Ilten, Philip; Izmaylov, Alexander; Kelly, Kevin J; Klarić, Juraj; Kopp, Joachim; Kulkarni, Suchita; Lamoureux, Mathieu; Lanfranchi, Gaia; López-Pavón, Jacobo; Mikulenko, Oleksii; Mooney, Michael; Nemevšek, Miha; Ovchynnikov, Maksym; Pascoli, Silvia; Plestid, Ryan; Rashad Darwish, Mohamed; Leo Redi, Federico; Ruchayskiy, Oleg; Ruiz, Richard; Shaposhnikov, Mikhail; Shchutska, Lesya; Shoemaker, Ian M; Shrock, Robert; Sousa, Alex; Van Remortel, Nick; Syvolap, Vsevolod; Takhistov, Volodymyr; Tastet, Jean-Loup; Timiryasov, Inar; Vincent, Aaron C; Yu, Jaehoon

Abstract

The existence of nonzero neutrino masses points to the likely existence of multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as heavy neutral leptons (HNLs). In this white paper, we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding of key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios.

Citation

Abdullahi, A. M., Barham Alzás, P., Batell, B., Beacham, J., Boyarsky, A., Carbajal, S., …Yu, J. (2023). The present and future status of heavy neutral leptons. Journal of Physics G: Nuclear and Particle Physics, 50(2), Article 020501. https://doi.org/10.1088/1361-6471/ac98f9

• Journal Article Type: Article
• Acceptance Date: Oct 11, 2022
• Online Publication Date: Jan 20, 2023
• Publication Date: 2023
• Deposit Date: May 4, 2023
• Publicly Available Date: May 4, 2023
• Journal: Journal of Physics G: Nuclear and Particle Physics
• Print ISSN: 0954-3899
• Electronic ISSN: 1361-6471
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 50
• Issue: 2
• Article Number: 020501
• DOI: https://doi.org/10.1088/1361-6471/ac98f9