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I'm a college undergrad (junior year, so basic knowledge of QM but not much else) and I'm reading up on neutrino oscillations. I have a few questions.

For neutrinos, which is more fundamental: The mass eigenstates or the flavour eigenstates? In this paper http://www2.warwick.ac.uk/fac/sci/physics/teach/module_home/px435/bkayser.pdf the author says, "Suppose that there are N physical neutrinos (mass eigenstates), [itex]\nu_{m}[/itex]..." So do the mass eigenstates represent physical particles which come together in different linear combinations to produce flavour? I am a bit confused about this issue.

Also, in the same paper, the author mentions in the first page, on the right side column: In the standard treatment it is supposed that we have a beam of neutrinos all having a common fixed momentum, [itex]p_{\mu}[/itex]. So when he talks about momentum, is he saying that all the different mass eigenstates have the same momentum? If so, why is it valid to assume that they all have a fixed common momentum? Why can't different mass eigenstates have different momenta?

Thank you very much for your help.

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# Question about neutrino oscillations

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