The process $e^{+}{e}^{-}\to \pi \pi X(3823)$ in the soft pion limit

Abstract

The production of the resonance $X(3823)$, identified as the charmonium ${}^3{D}_2$ state, in the process $e^{+}{e}^{-}\to \pi \pi X(3823)$ has been recently reported by BESIII. It is pointed out that this process is fully described, up to one overall coupling constant, in the soft pion limit. An interpretation of the available and possible future data within the discussed theoretical framework may reveal new features of the charmoniumlike states. In particular, the observed relative yield for this process at different energies strongly suggests a very significant enhancement of the amplitude at the charmoniumlike peak near 4.36\,GeV.

7 pages, 2 figures

References in corpus (4)

• Charmonium
• Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
• Observation of the $\psi (1^3{D}_2)$ state in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma {\chi }_{c1}$ at BESIII
• Combined fit to BaBar and Belle data on e+e- to pi+pi- psi(2S)