The open-charm radiative and pionic decays of molecular charmonium Y(4274)

TL;DR

This paper studies the decay properties and spectral line shapes of the Y(4274) as a molecular charmonium state, predicting specific decay widths and sharp spectral peaks to guide future experimental searches.

Contribution

It provides the first detailed calculation of decay widths and spectral line shapes for open-charm radiative and pionic decays of Y(4274) as a molecular state.

Findings

Decay widths up to 0.05 keV for radiative decays.

Decay widths up to 0.75 keV for pionic decays.

Sharp peaks in photon and pion spectra near maximum energy.

Abstract

In this work, we investigate the decay widths and the line shapes of the open-charm radiative and pionic decays of Y(4274) with the $D_s\bar{D}_{s0}(2317)$ molecular charmonium assignment. Our calculation indicates that the decay widths of $Y(4274)\to D^{+}_{s}D^{*-}_{s}\gamma$ and $Y(4274)\to D^+_{s}D^-_{s}\pi^0$ can reach up to 0.05 keV and 0.75 keV, respectively. In addition, the result of the line shape of the photon spectrum of $Y(4274)\to D_s^+ {D}_s^{*-} \gamma$ shows that there exists a very sharp peak near the large end point of photon energy. The line shape of the pion spectrum of $Y(4274)\to D_s^+ {D}_s^{*-} \pi^0$ is similar to that of the pion spectrum of $Y(4274)\to D_s^+ {D}_s^{*-} \gamma$, where we also find a very sharp peak near the large end point of pion energy. According to our calculation, we suggest further experiments to carry out the search for the open-charm radiative and pionic decays of Y(4274).