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Search for Heavy Neutrinos in $\pi \to \mu\nu$ Decay

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arxiv 1904.03269 v2 pith:BL4AETBU submitted 2019-04-05 hep-ex

A. Aguilar-Arevalo , M. Aoki , M. Blecher , D.I. Britton , D. vom Bruch , D.A. Bryman , S. Chen , J. Comfort
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L. Doria S. Cuen-Rochin P. Gumplinger A. Hussein Y. Igarashi S. Ito S.H. Kettell L. Kurchaninov L.S. Littenberg C. Malbrunot R.E. Mischke T. Numao D. Protopopescu A. Sher T. Sullivan D. Vavilov
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classification hep-ex
keywords heavyneutrinoneutrinosobservedwereadditiondecaydecays
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abstract

Heavy neutrinos were sought in pion decays $\pi^+ \rightarrow \mu^+ \nu$ by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a massless neutrino. No evidence for heavy neutrinos was observed. Upper limits were set on the neutrino mixing matrix $|U_{\mu i}|^2$ in the neutrino mass region of 15.7--33.8 MeV/c$^2$, improving on previous results by an order of magnitude.

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Forward citations

Cited by 6 Pith papers

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  1. A frequentist analysis of three right-handed neutrinos with GAMBIT

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    The paper derives the complete two-loop flavor-changing coupling of axion-like particles to b and s quarks and uses it to set updated limits on f_a in KSVZ, DFSZ and Flaxion models.

  3. Constraining axion-like particles from rare pion decays

    hep-ph 2019-08 accept novelty 6.0 of 10

    Existing PIENU and PIBETA rare pion decay data constrain ALP-pion mixing to sin^2 theta below about 1e-5 for ALP masses from 10 MeV to the pion mass.

  4. Archimedean Seesaw: Small Neutrino Masses and Large Lepton-number Violation

    hep-ph 2026-08 conditional novelty 5.0 of 10

    A texture-zero seesaw model allows large lepton-number violation together with naturally small neutrino masses by protecting the light neutrino with an accidental symmetry.

  5. Searches for heavy neutral lepton decays at spallation neutron sources

    hep-ph 2026-07 conditional novelty 5.0 of 10

    Current and future COHERENT detectors at the SNS can set competitive limits on HNL–neutrino mixings through pion/muon DAR production and in-detector e+e− decays, with muon mixing offering the strongest near-term reach.

  6. Searching for long-lived particles from stopped pions and muons at the CiADS-BDE

    hep-ph 2025-01 conditional novelty 4.0 of 10

    Projected 5-year sensitivity of the proposed CiADS-BDE shows reach beyond current bounds for HNLs, electrophilic and LFV ALPs, and RPV light binos.

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