Speaker
Description
Three mysteries stand after the discovery of the Higgs boson: (i) the
origin of the masses of the neutrinos; (ii) the origin of the baryon
asymmetry in the universe; and (iii) the nature
of dark matter. High energy colliders provide an exciting opportunity to
resolve these mysteries with the possible discovery of heavy neutral
leptons (HNLs), both at the HL-LHC from neutrinos produced in
semi-leptonic decays, or at a later stage using the large sample
(510^12) of Z bosons with 20% neutrino decay fraction, produced in
circular e+e- Higgs factories running at the Z pole.
The mixing between light and heavy neutrinos is expected to be very
small, resulting in very long lifetimes for the HNL, and in spectacular
signal topology. Even from Z decays, although the final state in this
reaction appears to be charge-insensitive, it is possible to distinguish
the Dirac vs Majorana nature of the neutrinos, by a variety of methods
that will be discussed. A Majorana nature could have considerable
implication for the generation of the Baryon Asymmetry of the Universe.
| Scientific topic | Symmetries |
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