Heavy quarkonium 2S states in light-front quark model

We study the charmonium 2S states $ψ'$ and $η_c'$, and the bottomonium 2S states $Υ'$ and $η_b'$, using the light-front quark model and the 2S state wave function of harmonic oscillator as the approximation of the 2S quarkonium wave function. The decay constants, transition form factors and masses of these mesons are calculated and compared with experimental data. Predictions of quantities such as Br$(ψ' \to γη_c')$ are made. The 2S wave function may help us learn more about the structure of these heavy quarkonia.

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