sibeen said:
mollwollfumble said:
We still don’t know what the masses of the electron neutrino, muon neutrino and tau neutrino are.
:-(
But we’re slowly centring in on a most likely mass.
https://arxiv.org/pdf/2203.14247.pdf Figure 6.
Electron neutrino mass ~0.005 eV
Muon neutrino mass 0.01 eV
Tau neutrino mass 0.05 eV
The least certain of these is the electron neutrino, where all we can be really sure of is that the mass is between 0.0 and 0.03 eV.
The muon neutrino mass is between 0.008 and 0.03 eV
The tau neutrino mass is between 0.048 and 0.06 eV
Compare those with the mass of the electron which is very much bigger at 511,000 eV.
Isn’t a bit hard to track down as they can change mutate between flavours.
That’s what makes it easy. The rate at which they change flavours is proportional to the (square of the) ratio of masses of the two different flavours.
But so far there have only been a limited number of flavour enhancement (LOL) experiments.
I thought I’d check neutrino mass against axion mass (if axions exist). They could be in the same ballpark.
The following figure is from https://arxiv.org/pdf/2203.14923.pdf
The purple region marked “ALPHA” is yet to be explored. The Region CAST has already been eliminated from solar observations. The regions “Haloscopes” and “Astrophysics” have also been eliminated.
So Axions of predicted photon coupling, near “1”, have to have a mass < 0.3 eV.
And neutrinos with observed masses 0.005 to 0.05 eV fall in that mass range. So they are in the same ballpark.
Wouldn’t it be fun if axion dark matter particles have the same mass as neutrinos?