Oscillations: Neutral Kaon vs neutrino

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Discussion Overview

The discussion revolves around the oscillation behavior of neutral kaons and neutrinos, specifically questioning why the same principles apply differently to these particles. It explores theoretical aspects of particle physics, including mass and weak eigenstates, superposition, and interactions.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes the oscillation of neutral kaons into their antiparticles and questions why neutrinos do not exhibit the same behavior in terms of superposition.
  • Another participant explains that mass eigenstates of neutrinos are mixtures of weak eigenstates, similar to quarks.
  • A different participant asserts that superpositions are indeed observed in neutrinos, as each mass eigenstate is a linear superposition of flavor states.
  • It is mentioned that while mass eigenstates propagate, the particle eigenstates interact via weak interactions, which occur on different time scales.
  • One participant acknowledges a mix-up in their understanding and apologizes for the confusion.

Areas of Agreement / Disagreement

Participants express differing views on the nature of superpositions in neutrinos and how they relate to the oscillation of neutral kaons. The discussion remains unresolved regarding the implications of these differences.

Contextual Notes

There are limitations in the discussion regarding the definitions of mass and weak eigenstates, as well as the conditions under which superpositions are observed. The time scales of interactions are also noted as a factor that may influence understanding.

Dmitry67
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I understand that
K_l = \frac{d\bar{s} + s\bar{d}}{\sqrt{2}}
K_s = \frac{d\bar{s} - s\bar{d}}{\sqrt{2}}
This happens because K_0 is oscillating into its own antiparticle.
My question is, why the same is not applicable to the neutrinos? They do oscillate. So instead of ‘pure’ e, mu, tau neutrinos we do not observe superposition?
 
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We detect mass eigenstates of neutrinos, but a mass eigenstate is a mixture of weak eigenstates. Similar for quarks, their mass and weak eigenstates are not the same.
 
We DO observe superpositions; we observe one of three mass eigenstates, each of which is a linear superposition of flavors.
 
In each case, the mass eigenstate propagates, but the particle eigenstate (d sbar or
say e-neutrino) interacts in the weak interaction. The time scales are different.
When you say "observe" that is the weak interaction.
 
clem said:
In each case, the mass eigenstate propagates, but the particle eigenstate (d sbar or
say e-neutrino) interacts in the weak interaction. The time scales are different.
When you say "observe" that is the weak interaction.

that is correct, i mixed them up. Sorry OP
 
ansgar said:
that is correct, i mixed them up. Sorry OP

So your thoughts are in superposition? :)

Thank you
 

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