If neutrinos are Dirac particles, their matter and antimatter versions are very different. If they are instead Majorana particles, the matter and antimatter components are the same thing. The neutrino is one of the most mysterious particles in the Standard Model. The original idea of neutrinos was formulated in response to a problem in beta decay, in which a neutron converts into an electron and a proton. (Historically, the electron in this kind of decay has been called a beta … Continue reading Neutrinos: Majorana or Dirac?