Heavy neutral leptons below the kaon mass at hodoscopic neutrino detectors

Argüelles, Carlos A.; Foppiani, Nicolò; Hostert, Matheus

doi:10.1103/PhysRevD.105.095006

Title: Heavy neutral leptons below the kaon mass at hodoscopic neutrino detectors

Journal Article · Wed May 11 00:00:00 EDT 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.105.095006· OSTI ID:1867309

;

Heavy neutral leptons (N) below the kaon mass are severely constrained by cosmology and lab-based searches for their decays in flight. If N interacts via an additional force, N→νe⁺e^- decays are enhanced and cosmological limits can be avoided. We show that the T2K and MicroBooNE neutrino experiments provide the best limits on the mixing of N with muon neutrinos, outperforming past-generation experiments, previously thought to dominate. We constrain models with electromagnetically decaying and long-lived N, such as in a transition-magnetic-moment portal and in a leptophilic axionlike particle portal, invoked to explain the MiniBooNE excess. By considering these models as representative examples, our results show that explanations of the MiniBooNE excess that involve e⁺e^- pairs from long-lived particles are in tension with T2K, PS191, and MicroBooNE data. Similarly, these searches also constrain MiniBooNE explanations based on single photons due to the associated e⁺e^- decay mode via a virtual photon.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: SC0007881; SC0011842; PHY-1607611

OSTI ID:: 1867309

Alternate ID(s):: OSTI ID: 1905305

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 9; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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