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Search for heavy neutral lepton production in $K^+$ decays

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arxiv 1712.00297 v2 pith:TYK2ZZLZ submitted 2017-12-01 hep-ex

classification hep-ex
keywords decaysheavyleptonneutralproductionlimitsmassrange
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the $10^{-7}$ to $10^{-6}$ level are established on the elements of the extended neutrino mixing matrix $|U_{\ell 4}|^2$ ($\ell=e,\mu$) for heavy neutral lepton mass in the range $170-448~{\rm MeV}/c^2$. This improves on the results from previous production searches in $K^+$ decays, setting more stringent limits and extending the mass range.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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

    hep-ph 2019-08 conditional novelty 7.0 of 10

    A comprehensive frequentist global fit maps the currently allowed mass and mixing space for three right-handed neutrinos between 60 MeV and 500 GeV and finds no significant new physics.

  2. Light scalar production from Higgs bosons and FASER 2

    hep-ph 2019-08 conditional novelty 6.0 of 10

    A general scalar portal with independent production and decay couplings lets FASER 2 with a 1.5 m radius detector probe scalar masses from a few GeV up to half the Higgs mass.

  3. Sensitivity of Lepton Number Violating Meson Decays in Different Experiments

    hep-ph 2019-08 conditional novelty 5.0 of 10

    For 0.14 to 6 GeV heavy neutrinos, accounting for the parent meson's velocity weakens projected LNV meson decay sensitivities by one to two orders of magnitude at NA62 and SHiP.

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