A novel explanation of charmonium-like structure in $e^+e^-\to ψ(2S)π^+π^-$

Details A novel explanation of charmonium-like structure in $e^+e^-\to ψ(2S)π^+π^-$ A novel explanation of charmonium-like structure in $e^+e^-\to ψ(2S)π^+π^-$

2011-01-13

arxiv.org/abs/1101.2474v3

Phys.Rev.D83:074012,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 table, 2 figures. Accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.074012

We first present a non-resonant description to charmonium-like structure $Y(4360)$ in the $\psi(2S)\pi^+\pi^-$ invariant mass spectrum of the $e^+e^-\to \psi(2S)\pi^+\pi^-$ process. The $Y(4360)$ structure is depicted well by the interference effect of the production amplitudes of $e^{+} e^{-} \to \psi(2S) \pi^+ \pi^-$ via the intermediate charmonia $\psi(4160)/\psi(4415)$ and direct $e^+e^-$ annihilation into $\psi(2S)\pi^+ \pi^-$. This fact shows that $Y(4360)$ is not a genuine resonance, which naturally explains why $Y(4360)$ was only reported in its hidden-charm decay channel $\psi(2S)\pi^+\pi^-$ and was not observed in the exclusive open-charm decay channel or $R$-value scan.

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