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Why are neutrino oscillations insensitive to Majorana phases?

I'm guessing it has something to do with them being factored out the PMNS matrix using a diagonal matrix ... i.e.

U_PMNS = U Diag (a1, a2, 1)

Is there a point in the oscillation calculation where they always cancel due to a complex conjugate?

You end up with the following in a two-flavour probability

SUM_ij ( Uai U*bi U*aj Ubj )

The majorana phases fall on the diagonals

But in this formula, if i=1, j=2 and b=1, a=2

then you end up with a both the dirac phases in the term

What am I missing? Have we lost the majorana phases before this part?

Cheers

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# Neutrino oscillations and Majorana Phase

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