New Constraints on Tau-Coupled Heavy Neutral Leptons with Masses m_{N}=280-970 MeV.
Phys Rev Lett
; 127(12): 121801, 2021 Sep 17.
Article
em En
| MEDLINE
| ID: mdl-34597110
ABSTRACT
A search for heavy neutral leptons has been performed with the ArgoNeuT detector exposed to the NuMI neutrino beam at Fermilab. We search for the decay signature Nâνµ^{+}µ^{-}, considering decays occurring both inside ArgoNeuT and in the upstream cavern. In the data, corresponding to an exposure to 1.25×10^{20} POT, zero passing events are observed consistent with the expected background. This measurement leads to a new constraint at 90% confidence level on the mixing angle |U_{τN}|^{2} of tau-coupled Dirac heavy neutral leptons with masses m_{N}=280-970 MeV, assuming |U_{eN}|^{2}=|U_{µN}|^{2}=0.
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MEDLINE
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En
Ano de publicação:
2021
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Article