Intrinsic parity

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Intrinsic parity

In quantum mechanics, the intrinsic parity is a phase factor that arises as an eigenvalue of the parity operation (a reflection about the origin).To see that the parity's eigenvalues are phase factors, we assume an eigenstate of the parity operation (this is realized because the intrinsic parity is a property of a particle species) and use the fact that two parity transformations leave the particle in the same state, thus the new wave function can differ by only a phase factor, i.e.: thus , since these are the only eigenstates satisfying the above equation.

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[fosheimdet]

Thank you for this gem! Very well explained indeed.