What Is Matter According to Particle Physics, and Why Try to Observe Its Creation in a Lab?

  title={What Is Matter According to Particle Physics, and Why Try to Observe Its Creation in a Lab?},
  author={Francesco Vissani},
The standard model of elementary interactions has long qualified as a theory of matter, in which the postulated conservation laws (one baryonic and three leptonic) acquire theoretical meaning. However, recent observations of lepton number violations—neutrino oscillations—demonstrate its incompleteness. We discuss why these considerations suggest the correctness of Ettore Majorana’s ideas on the nature of neutrino mass and add further interest to the search for an ultra-rare nuclear process in… 

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