PATIENT HUNT. “Smaller prototypes tested at CERN, Europe’s particle-physics lab near Geneva, Switzerland, have demonstrated the feasibility of the large-scale DUNE detector. T2HK and DUNE therefore provide complementary techniques and measurements. They will probably give us a definitive answer in the quest for CP violation in the next 15 years.” (By 2035). (CP = charge-conjugation parity-reversal).”
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https://www.nature.com/articles/d41586-020-01000-9