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. Wu; T. Yang

doi:10.1103/PhysRevLett.127.121801

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

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 language	English (US)
Article number	121801
Journal	Physical Review Letters
Volume	127
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.127.121801
State	Published - Sep 17 2021

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.127.121801

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Acciarri, R., Adams, C., Asaadi, J., Baller, B., Basque, V., Cavanna, F., De Gouvêa, A., Fitzpatrick, R. S., Fleming, B., Green, P., James, C., Kelly, K. J., Lepetic, I., Luo, X., Palamara, O., Scanavini, G., Soderberg, M., Spitz, J., Szelc, A. M., ... Yang, T. (2021). New Constraints on Tau-Coupled Heavy Neutral Leptons with Masses mN=280-970 MeV. Physical Review Letters, 127(12), Article 121801. https://doi.org/10.1103/PhysRevLett.127.121801

Acciarri, R, Adams, C, Asaadi, J, Baller, B, Basque, V, Cavanna, F, De Gouvêa, A, Fitzpatrick, RS, Fleming, B, Green, P, James, C, Kelly, KJ, Lepetic, I, Luo, X, Palamara, O, Scanavini, G, Soderberg, M, Spitz, J, Szelc, AM, Wu, W & Yang, T 2021, 'New Constraints on Tau-Coupled Heavy Neutral Leptons with Masses mN=280-970 MeV', Physical Review Letters, vol. 127, no. 12, 121801. https://doi.org/10.1103/PhysRevLett.127.121801

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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.",

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AU - Basque, V.

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AU - De Gouvêa, A.

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AU - James, C.

AU - Kelly, K. J.

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AU - Scanavini, G.

AU - Soderberg, M.

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

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