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- TL;DR Summary
- Measurements clearly favor non-zero CP violation in the neutrino sector.
Publication: Constraint on the matter–antimatter symmetry-violating phase in neutrino oscillations
Edit: arXiv: Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations
Article: Neutrino Asymmetry Passes Critical Threshold
Previous measurements already hinted at this, now we have a relatively strong single measurement.
CP violation is linked to matter/antimatter asymmetries. They are small for quarks, but it looks like they are larger in the neutrino sector. The measurement favors the maximal CP violation that was still within the range set by other parameters.
DUNE will measure this parameter more precisely in the future.
Significant CP violation in the neutrino sector might be an explanation for the matter/antimatter asymmetry today (our universe has matter but nearly no antimatter).
The other big open question in neutrino mixing is the mass ordering - two light neutrinos and a (relatively) heavy one, as most people expect, or one light neutrino and two heavier ones? This measurement favors the former slightly, just like many others did in the past, but more measurements will be needed. DUNE will help there, too.
Edit: arXiv: Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations
Article: Neutrino Asymmetry Passes Critical Threshold
Previous measurements already hinted at this, now we have a relatively strong single measurement.
CP violation is linked to matter/antimatter asymmetries. They are small for quarks, but it looks like they are larger in the neutrino sector. The measurement favors the maximal CP violation that was still within the range set by other parameters.
DUNE will measure this parameter more precisely in the future.
Significant CP violation in the neutrino sector might be an explanation for the matter/antimatter asymmetry today (our universe has matter but nearly no antimatter).
The other big open question in neutrino mixing is the mass ordering - two light neutrinos and a (relatively) heavy one, as most people expect, or one light neutrino and two heavier ones? This measurement favors the former slightly, just like many others did in the past, but more measurements will be needed. DUNE will help there, too.
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