New Constraints on Tau-Coupled Heavy Neutral Leptons with Masses mN=280-970 MeV

R. Acciarri, C. Adams, J. Asaadi, B. Baller, V. Basque, F. Cavanna, A. De Gouvêa, R. S. Fitzpatrick, B. Fleming, P. Green, C. James, K. J. Kelly, I. Lepetic, X. Luo, O. Palamara, G. Scanavini, M. Soderberg, J. Spitz, A. M. Szelc, W. WuT. Yang

Research output: Contribution to journalArticlepeer-review

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 N→νμ+μ-, considering decays occurring both inside ArgoNeuT and in the upstream cavern. In the data, corresponding to an exposure to 1.25×1020 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 |UτN|2 of tau-coupled Dirac heavy neutral leptons with masses mN=280-970 MeV, assuming |UeN|2=|UμN|2=0.

Original languageEnglish (US)
Article number121801
JournalPhysical Review Letters
Volume127
Issue number12
DOIs
StatePublished - Sep 17 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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