Dian-Yong Chen

Reproducing the

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

Z_c(3900)

Inspired by the newly observed two charged bottomonium-like states, we consider the possible contribution from the intermediate

structure through the initial-single-pion-emission mechanism

Z_b(10610)

Charged bottomonium-like states

and

Z_b(10610)

Z_b(10650)

and

states to the

Z_b(10650)

\Upsilon(5S)\to \Upsilon(2S)\pi^+\pi^-

and the

decay process, which naturally explains Belles previous observation of the anomalous

\Upsilon(5S)\to \Upsilon(2S)\pi^+\pi^-

\Upsilon(2S)\pi^+\pi^-

decay

production near the peak of