Speaker
Guillermo Gambini
(McGill University, Campinas State University (UNICAMP))
Description
Heavy neutral leptons (HNL) are SM-gauge-singlet fermions that mix with active neutrinos. We argue that beam-dump and other limits on these mixings $U$ cannot be directly applied to HNLs that interact with a light SM-gauge-singlet scalar $s$ which mixes with the Higgs boson. We reinterpret the limits from the DELPHI, Belle, and CHARM experiments taking into account the new decay channel $N\to s\nu$ which could be dominant causing some ruled-out regions in the $m_N-U$ parameter space to reopen.
Authors
Guillermo Gambini
(McGill University, Campinas State University (UNICAMP))
Prof.
James M. Cline
(McGill University)