Regular Article – Theoretical Physics
GeV-scale neutrinos: interactions with mesons and DUNE sensitivity
Instituto de Física Corpuscular, Universidad de Valencia and CSIC, Edificio Institutos Investigación, Catedrático José Beltrán 2, 46980, Valencia, Spain
2 Instituto de Física Teórica, Universidad Autónoma de Madrid and CSIC, Campus de Cantoblanco, 28049, Madrid, Spain
3 Departamento de Física Teórica, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain
4 Institute for Theoretical Physics, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, 1117, Budapest, Hungary
5 Fermi National Accelerator Laboratory, 60510, Batavia, IL, USA
Accepted: 28 December 2020
Published online: 25 January 2021
The simplest extension of the SM to account for the observed neutrino masses and mixings is the addition of at least two singlet fermions (or right-handed neutrinos). If their masses lie at or below the GeV scale, such new fermions would be produced in meson decays. Similarly, provided they are sufficiently heavy, their decay channels may involve mesons in the final state. Although the couplings between mesons and heavy neutrinos have been computed previously, significant discrepancies can be found in the literature. The aim of this paper is to clarify such discrepancies and provide consistent expressions for all relevant effective operators involving mesons with masses up to 2 GeV. Moreover, the effective Lagrangians obtained for both the Dirac and Majorana scenarios are made publicly available as FeynRules models so that fully differential event distributions can be easily simulated. As an application of our setup, we numerically compute the expected sensitivity of the DUNE near detector to these heavy neutral leptons.
© The Author(s) 2021
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