- #1

- 1,183

- 347

## Main Question or Discussion Point

Compared to the other fermions, I have always had much less interest in Koide mass formulas for neutrinos. There is less data, and neutrino mass works differently anyway (Dirac plus Majorana, whereas the other fermions are just Dirac).

But today that has changed. First, today we have a paper that predicts Dirac

http://arxiv.org/abs/1601.00754

Yong-Chang Huang, Syeda Tehreem Iqbal, Zhen Lei, Wen-Yu Wang

(Submitted on 5 Jan 2016)

Masses of the three generations of charged leptons are known to completely satisfy the Koide's mass relation. But the question remains if such a relation exists for neutrinos? In this paper, by considering SeeSaw mechanism as the mechanism generating tiny neutrino masses, we show how neutrinos satisfy the Koide's mass relation, on the basis of which we systematically give exact values of not only left but also right handed neutrino masses.

And second, we have been discussing various minimal BSM theories, in which the masses of the right-handed neutrinos are constrained by astrophysics. We have discussed NMSM and vMSM, and I'd also like to mention this model which is SM + RH neutrinos + axion.

With a completely predictive Koide-like ansatz and a definite physical framework, we can ask if the predicted numbers are compatible with the framework, yes or no. And that's progress.

So we may be entering a time when there can be a tighter interaction between Koide ansatze, and BSM phenomenology.

But today that has changed. First, today we have a paper that predicts Dirac

*and*Majorana masses, using a Koide-like ansatz:http://arxiv.org/abs/1601.00754

**Some New Symmetric Relations and the Prediction of Left and Right Handed Neutrino Masses using Koide's Relation**Yong-Chang Huang, Syeda Tehreem Iqbal, Zhen Lei, Wen-Yu Wang

(Submitted on 5 Jan 2016)

Masses of the three generations of charged leptons are known to completely satisfy the Koide's mass relation. But the question remains if such a relation exists for neutrinos? In this paper, by considering SeeSaw mechanism as the mechanism generating tiny neutrino masses, we show how neutrinos satisfy the Koide's mass relation, on the basis of which we systematically give exact values of not only left but also right handed neutrino masses.

And second, we have been discussing various minimal BSM theories, in which the masses of the right-handed neutrinos are constrained by astrophysics. We have discussed NMSM and vMSM, and I'd also like to mention this model which is SM + RH neutrinos + axion.

With a completely predictive Koide-like ansatz and a definite physical framework, we can ask if the predicted numbers are compatible with the framework, yes or no. And that's progress.

So we may be entering a time when there can be a tighter interaction between Koide ansatze, and BSM phenomenology.