NA62 establishes 10^{-11}-level upper limits on K^+ to pi^+ X branching ratios and 10^{-8}-level limits on |U_e4|^2 for heavy neutral leptons between 95 and 126 MeV/c^2, constraining portal models.
Bloch-Devauxet al.[NA62], Phys
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New physics searches at NA62
NA62 establishes 10^{-11}-level upper limits on K^+ to pi^+ X branching ratios and 10^{-8}-level limits on |U_e4|^2 for heavy neutral leptons between 95 and 126 MeV/c^2, constraining portal models.