Search for heavy neutral leptons in B-meson decays

A search for long-lived heavy neutral leptons produced in B-meson decays and decaying to a μ<sup>±</sup>π<sup>∓</sup> final state is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 fb<sup>−1</sup>. The results are interpreted in both lepton-number-conserving and lepton-number-violating scenarios. No significant excess is observed. Constraints are placed on the squared mixing element |U<sub>μN</sub>|<sup>2</sup> to the active muon neutrino, under the assumption that couplings to other lepton flavours are negligible, in the mass range of 1.6–5.5 GeV.

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SPIRE - Sciences Po Institutional REpository
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2025-12-17
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Particle physics theoretical and experimental studies
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article

Search for heavy neutral leptons in B-meson decays

Alice Moro, Lorenzo Nisi, Q. Li, F. Borgato et al.
SPIRE - Sciences Po Institutional REpository
Particle physics theoretical and experimental studies
article

Search for heavy neutral leptons in B-meson decays

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Abstract

A search for long-lived heavy neutral leptons produced in B-meson decays and decaying to a μ<sup>±</sup>π<sup>∓</sup> final state is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 fb<sup>−1</sup>. The results are interpreted in both lepton-number-conserving and lepton-number-violating scenarios. No significant excess is observed. Constraints are placed on the squared mixing element |U<sub>μN</sub>|<sup>2</sup> to the active muon neutrino, under the assumption that couplings to other lepton flavours are negligible, in the mass range of 1.6–5.5 GeV.

SPIRE - Sciences Po Institutional REpository
Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Laboratoire d’Annecy de Physique des Particules (FR), Centre de physique des particules de Marseille (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), CEA Paris-Saclay (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire Leprince-Ringuet (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR)
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