B4cklfip
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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?
$$\psi(2S) \rightarrow \gamma + \eta({1}^S_0)$$
$$\psi(2S) \rightarrow \gamma + \chi_{c0}({3}^P_0)$$
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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