Search for heavy neutral leptons in B-meson decays

Journal of High Energy Physics 2026 Open access

Read full text
Authors: R. Aaij, A. S. W. Abdelmotteleb, Carlos Abellán Beteta, C. Abellán Beteta, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P. Adlarson, C. Agapopoulou, C. Aidala, Z. Ajaltouni
+88 more S. Akar, K. Carvalho Akiba, P. Albicocco, J. Albrecht, R. Aleksiejūnas, F. Alessio, P. Álvarez Cartelle, R. Amalric, S. Amato, S. Amato, Y. Amhis, L. An, L. Anderlini, M. Andersson, P. Andreola, M. Andreotti, Sergio Andres Estrada, Alessia Anelli, D. Ao, C. Arata, F. Archilli, Zaratsyan Areg, Matteo Argenton, S. Arguedas Cuendis, Lisa Arnone, A. Artamonov, M. Artuso, E. Aslanides, R. Ataíde Da Silva, M. Atzeni, B. Audurier, Juliette Authier, D. Bacher, I. Bachiller, S. Bachmann, Marie Bachmayer, J. J. Back, P. Baladrón Rodríguez, V. Balagura, A Balboni, W. Baldini, Z. Baldwin, Luca Balzani, H. Bao, J. Baptista de Souza Leite, C. Barbero Pretel, M. Barbetti, I. R. Barbosa, R. J. Barlow, Mikhail Barnyakov, S. Barsuk, W. Barter, W. Barter, B. Batsukh, B. Batsukh, Piera Battista, A. Bay, A. Beck, A. Beck, F. Bedeschi, I. Bediaga, Noah Albin Behling, S. Belin, Alberto Bellavista, K. Belous, I. Belov, I. Belyaev, E. Ben-Haim, G. Benane, G. Bencivenni, A. Berezhnoy, R. Bernet, H. C. Bernstein, A. Bertolin, F. Betti, J. Bex, O. Bezshyyko, Senjuti Bhattacharya, J. Bhom, M. S. Bieker, N. V. Biesuz, A. Biolchini, M. Birch, F. C. R. Bishop, A. Bitadze, A. Bizzeti, T. Blake, F. Blanc
DOI: 10.1007/jhep03(2026)178
Cited by: 2
References: 38

Abstract

A bstract A search for long-lived heavy neutral leptons produced in B-meson decays and decaying to a μ ± π ∓ 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 − 1 . 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 μN | 2 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.

Fields of Study & Subjects

Particle physics theoretical and experimental studies Computational Physics and Python Applications Neutrino Physics Research

Publication details

Journal / source
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Volume
2026
Issue
3
Publication date
18 March 2026
Language
EN