NA62 sensitivity to heavy neutral leptons in the low scale seesaw model

Apr 10, 2019, 9:20 AM
Palazzo Badini-Confalonieri - Sala Seminari

Palazzo Badini-Confalonieri - Sala Seminari

Via Verdi, 10 Turin
Parallel Session Talk WG3: Higgs and BSM Physics in Hadron Collisions WG3: Higgs and BSM Physics in Hadron Collisions


Jan Hajer (Université catholique de Louvain)


The sensitivity of beam dump experiments to heavy neutral leptons depends on the relative strength of their couplings to individual lepton flavours in the Standard Model. We study the impact of present neutrino oscillation data on these couplings in the minimal type I seesaw model and find that it significantly constrains the allowed heavy neutrino flavour mixing patterns. We estimate the effect that the DUNE experiment will have on these predictions. We then discuss implication that this has for the sensitivity of the NA62 experiment when operated in the beam dump mode and provide sensitivity estimates for different benchmark scenarios. We find that the sensitivity can vary by almost two orders of magnitude for general choices of the model parameters, but depends only weakly on the flavour mixing pattern within the parameter range that is preferred by neutrino oscillation data.

Primary authors

Jan Hajer (Université catholique de Louvain) Marco Drewes (Universite Catholique de Louvain (UCL) (BE)) Mr Juraj Klaric (Technische Universität München) Gaia Lanfranchi (INFN e Laboratori Nazionali di Frascati (IT))

Presentation materials