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Heavy Neutral Leptons from Stopped Muons and Pions

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arxiv 2306.07315 v1 pith:O3QYNCCM submitted 2023-06-12 hep-ph hep-ex

classification hep-phhep-ex
keywords muonsexperimentsheavyleptonslsndmuonneutralneutrinos
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Stopped muons, which are generic in pion-at-rest experiments, can shed light on heavy neutral leptons (HNLs) in unexplored parameter spaces. If the HNL is lighter than the muon, the HNL can be produced from decays of muons and pions.The HNL will travel from the production location and decay into visible Standard Model (SM) modes, leaving signals inside downstream detectors. We find that in the case that the HNL dominantly mixes with muon neutrinos, the LSND constraint on the mixing angle squared is stronger than all the previous constraints by more than an order of magnitude. In this study, we recast the LSND measurement of the $\nu-e$ scattering. Future experiments such as PIP2-BD could further improve the sensitivity, provided they can distinguish the HNL events from backgrounds induced by the SM neutrinos.

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Cited by 2 Pith papers

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

  1. 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.

  2. Probing Long-Lived Particle Production in Muon Decays at the SNS with a Highly Capable Hydrocarbon Detector

    hep-ex 2026-06 unverdicted novelty 4.0 of 10

    Proposes a hydrocarbon detector at SNS for order-of-magnitude better sensitivity to 10-100 MeV axion-like particles and heavy neutral leptons via e+e- decays from muon decays at rest.

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