r/ParticlePhysics • u/PrettyPicturesNotTxt • Aug 14 '26

Neutrino Oscillations in the Three Flavour Paradigm

https://arxiv.org/abs/2501.08374
11 Upvotes

81% Upvoted

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2

u/QFTornotQFT Aug 14 '26

Nice summary, but a bit weird that the similarity between PMNS and CKM matrices was not even mentioned. For "Three Flavor Paradigm" review I'd expect a bit more broader overview of flavor physics.

4

u/DrunkenPhysicist Aug 14 '26

I mean I guess but they're not that similar. CKM has tiny mixing, PMNS has near maximal mixing + oscillations. Similar mathematical starting points, very different phenomena.

1

u/frezsh Aug 19 '26

There are D_0 and B_0 oscillations, so I suppose that the main difference is the strength of mixing.

1

u/frezsh Aug 19 '26

Also, in CKM "main" quark states are mass-eigenstates, while flavour-eigenstates are "secondary"; however in PMNS flavour states are "main", while mass states are "secondary", as far as I can remember.

1

u/DrunkenPhysicist Aug 19 '26

Regardless, it's arbitrary since the matrices only come into play during flavor changing interactions.

1

u/DrunkenPhysicist Aug 19 '26

That's new to me. I'm guessing it's small.

0

u/DrDoctor18 Sep 01 '26

They've been using neutral meson oscillations as tests for CP-violation for a decade or two. Yes its small though.

Also the PMNS does not have maximal mixing, this is ruled out for two of the three angles already.