# Electromagnetic transitions of ##\psi(2S)##

• A
When the ##\psi(2s)## particle decays also the following two transitions are observed

$$\psi(2S) \rightarrow \gamma + \eta({1}^S_0)$$
$$\psi(2S) \rightarrow \gamma + \chi_{c0}({3}^P_0)$$

The branching fraction for the first decay is about ##3.4*10^{-3}## while it's ##9.7*10^{-2}## for the second one.
Where does the difference come from?

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Why do you think it should be the same?