Searching for the pseudoscalar partner of $G(3900)$ via radiative $Y(4230)$ decays

Abstract

Inspired by the $P$-wave molecular interpretation of the recently observed vector state $G(3900)$, we analyze the production of its possible pseudoscalar partner, denoted here as $G_0(3900)$, via the radiative decay $Y(4230)\to {\hat{I}}^3{G}_0(3900)$. The $G_0(3900)$ is interpreted as a $P$-wave molecular state with quantum numbers $J^{PC}=0^{-+}$, dominated by the $D{\bar{D}}^{\ast }/\bar{D}{D}^{\ast }$ components. Although not yet experimentally established, such a structure is expected to appear near the $D{\bar{D}}^{\ast }$ threshold and to exhibit characteristic production patterns. The decay is assumed to proceed through a triangle mechanism. Depending on the model parameters and the binding energy of $G_0(3900)$, the resulting branching fraction lies in the range $\mathcal{B}(Y(4230)\to {\hat{I}}^3{G}_0(3900))=3.8\times 10^{-5}-3.3\times 10^{-4}$. Our results offer a pathway to search for signatures of $G_0(3900)$ in radiative channels and also provide a test of the consistency of loop-mediated radiative decays with a molecular description of the $Y(4230)$.

17 pages, 5 figures; figs. 1 and 2 corrected