Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 50, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6471/ac98f9
Keywords
Neutrinos; beyond the standard model; sterile neutrinos
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The existence of nonzero neutrino masses suggests the presence of multiple Standard Model neutral fermions known as heavy neutral leptons (HNLs). This white paper discusses the current experimental status of HNLs, including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. It highlights the importance of further searching for HNLs and its potential impact on fundamental questions, as well as outlining future prospects for next-generation experiments or upcoming accelerator run scenarios.
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.
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