A Discover the Cross Section of η′→γγ and Its Calculation Methods

zihao yu
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Is there any measure for cross section of η′→γγ? Or has anyone did the calculation??
 
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That is a decay, decays have decay rates, not cross sections.
 
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\%##
http://pdglive.lbl.gov/BranchingRatio.action?parCode=M002&desig=6

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

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