The Present and Future Status of Heavy Neutral Leptons

The existence of non-zero neutrino masses points to the likely existence of multiple SM 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 stat...

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Published in:arXiv.org 2022-03
Main Authors: Abdullahi, Asli M, Pablo Barham Alzas, Batell, Brian, Boyarsky, Alexey, Carbajal, Saneli, Chatterjee, Animesh, Crespo-Anadon, Jose I, Deppisch, Frank F, De Roeck, Albert, Drewes, Marco, Alberto Martin Gago, Rebeca Gonzalez Suarez, Goudzovski, Evgueni, Hatzikoutelis, Athanasios, Hufnagel, Marco, Ilten, Philip, Izmaylov, Alexander, Kelly, Kevin J, Klaric, Juraj, Kopp, Joachim, Kulkarni, Suchita, Lamoureux, Mathieu, Lanfranchi, Gaia, Lopez-Pavon, Jacobo, Mikulenko, Oleksii, Mooney, Michael, Nemevsek, Miha, Ovchynnikov, Maksym, Pascoli, Silvia, Ryan Plestid, Mohamed Rashad Darwish, Redi, Federico Leo, Ruchayskiy, Oleg, Ruiz, Richard, Shaposhnikov, Mikhail, Shoemaker, Ian M, Shrock, Robert, Sousa, Alex, Nick Van Remortel, Syvolap, Vsevolod, Takhistov, Volodymyr, Jean-Loup Tastet, Timiryasov, Inar, Vincent, Aaron C, Yu, Jaehoon
Format: Article
Language:English
Subjects:
Beta decay
Fermions
Leptons
Neutrinos
Online Access:Get full text
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Summary:The existence of non-zero neutrino masses points to the likely existence of multiple SM 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 on key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios.
ISSN:2331-8422
DOI:10.48550/arxiv.2203.08039