Reproducing the $Z_c(3900)$ structure through the initial-single-pion-emission mechanism

Being stimulated by the recent BESIII observation of a charged charmoniumlike structure $Z_c(3900)$, in this work we study the distributions of the $J/ψπ^\pm$ and $π^+π^-$ invariant mass spectra of the $Y(4260)\to π^+π^- J/ψ$ decay by the initial-single-pion-emission mechanism, where the interference effects of the ISPE mechanism with two other decay modes are also taken into account. The obtained $dΓ(Y(4260)\to π^+π^- J/ψ)/dm_{J/ψπ^\pm}$ and $dΓ(Y(4260)\to π^+π^- J/ψ)/dm_{π^+ π^-}$ marvelously agree with the BESIII data to reproduce the $Z_c(3900)$ structure.

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