Seminari

What is matter according to particle physics and why try to observe its creation in lab

Name: What is matter according to particle physics and why try to observe its creation in lab
Start: 2021-03-19T11:30:00+01:00
End: 2021-03-19T12:30:00+01:00
Location: No location set

by Francesco Vissani (LNGS)

Friday 19 Mar 2021, 11:30 → 12:30 Europe/Rome

Description

Zoom Room
https://cern.zoom.us/j/61372856796?pwd=TzRUTkVxRExNY0x3c051N0ZqcEtFdz09

Abstract
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 which two particles of matter (electrons) are created, commonly called neutrinoless double beta decay. The approach of the discussion is mainly historical and its character is introductory.