Radiative decays of the neutral $Z_c(3900)$

TL;DR

This paper predicts the radiative decay widths and production cross sections of the neutral Zc(3900) assuming it is a D D* hadronic molecule, providing testable predictions for experiments like BESIII and BelleII.

Contribution

It offers the first detailed predictions of radiative decay widths and cross sections for Zc(3900) as a hadronic molecule, guiding future experimental searches.

Findings

Decay widths around 10 keV for specific channels.

Cross sections approximately 0.1 pb at 4.23 GeV.

Predictions are accessible to current experiments.

Abstract

We study the radiative decays of the $Z_c(3900)^0$ in a hadronic molecule picture, where the $Z_c(3900)$ is treated as a $D \bar{D}^\ast +c.c$ hadronic molecule. The partial widths of $\Gamma(Z_c(3900)^0 \to \gamma \eta_c(2S))$ and $\Gamma(Z_c(3900)^0 \to \gamma \chi_{c0})$ are predicted to be of order 10 keV and the cross sections for $\sigma(e^+ e^- \to \pi^0 Z_c(3900) \to \pi^0 \gamma \eta_c(2S))$ and $\sigma(e^+ e^- \to \pi^0 Z_c(3900) \to \pi^0 \gamma \chi_{c0})$ are of order 0.1 pb at 4.23 GeV, which may be accessible for the BESIII and forthcoming BelleII.