In derivation of two-neutrino oscillation probability, it was assumed that the mass states have the same momentum. Why is that?
Source: https://www.youtube.com/watch?v=nXzur-2hbkI&t=115s&ab_channel=MITOpenCourseWare
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1Linked and also. It's easier to assume they have the same energy, but it makes no practical difference. – Cosmas Zachos Apr 03 '23 at 19:06
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Lipkin's helpful paper. – Cosmas Zachos Apr 03 '23 at 19:18
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Momentum and energy conservation. These fields can't just "magically" acquire a different energy or momentum. If we would observe such a change, then we would have to find another field that they interact with. – FlatterMann Apr 03 '23 at 19:30