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How could this,Sigma0 decay into Lambda and gamma, happens?

  1. Nov 9, 2015 #1
    I found an article, titled Electromagnetic Decay of the Σ0(1385) to Λγ , in the arXiv telling that the reaction
    Σ0→Λ+γ
    can happen through electromagnetic interaction. However, if I examine the conservation of parity. Parity on the left side is even(P(Σ0)=+), but that on the right side is odd(P(Λ)=+, while P(γ)=-). In this sense, the parity conservation is violated. In addition, I am convinced that the parity is conserved under electromagnetic interaction, so this reaction by no means can exist.
     
  2. jcsd
  3. Nov 9, 2015 #2

    Orodruin

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    Those are the intrinsic parities of the particle states. You also need to consider the parity of the wave-function of the final state.
     
  4. Nov 9, 2015 #3
    Thank you so much! Problem solved. :biggrin:
     
  5. Nov 9, 2015 #4
    Since I can't simply multiply the parity of the Lambda bayon and the photon, how can I calculate the parity of the final state?
     
  6. Nov 9, 2015 #5

    mfb

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    You can, but you also have to multiply it with the parity of the wave-function combining the two particles.
     
  7. Nov 9, 2015 #6
    Does "the parity of the wave-function combining the two particle" mean the parity valued (-1)L, where L is the orbital quantum number?
     
  8. Nov 10, 2015 #7

    mfb

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    Right.
     
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