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A Cross section of η′→γγ

  1. Aug 9, 2016 #1
    Is there any measure for cross section of η′→γγ? Or has anyone did the calculation??
  2. jcsd
  3. Aug 9, 2016 #2


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    That is a decay, decays have decay rates, not cross sections.
  4. Aug 9, 2016 #3


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    The PDG averages for the partial width of ##\eta^\prime \to \gamma \gamma## is ##4.28\pm0.19~\rm{keV}##, and the branching fraction is ##2.00\pm0.15\%##

    I don't know how you'd go about calculating these things.
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