Abstract
The presence of Heavy Neutral Leptons (HNL, M ≈ O(1 GeV)), or heavy sterile neutrinos is proposed in various theories in order to solve current problems of the Standard Model (SM), e.g. the origin of (tiny) neutrino masses, dark matter, baryon asymmetry etc. The T2K provides intense neutrino beam from both pion and kaon parents and hence allows to carry out experimental search for the HNL of 0.44 GeV) and the cross-check of the previous results for lower masses.
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