arXiv subjects

Jin-Cheng Deng

Publications and source records attributed to Jin-Cheng Deng.

2 recordsLinked to original sources

arXiv2026

Strong decays of the hidden-charm molecular pentaquarks

We investigate the strong decays of the recently observed hidden-charm pentaquarks $P_{\psi}^N(4312)$, $P_{\psi}^N(4440)$, and $P_{\psi}^N(4457)$, as well as $P_{\psi s}^\Lambda(4338)$ and $P_{\psi s}^\Lambda(4459)$, within the molecular framework using the effective Lagrangian approach. We construct the effective Lagrangians describing the S-wave couplings between these pentaquarks and their constituent hadrons, namely $\Sigma_c\bar{D}^{(*)}$ and $\Xi_c\bar{D}^{(*)}$, and determine the coupling constants via the residues of the scattering $T$-matrix at the bound-state poles. Our results show that the decay widths are sensitive to the cutoff parameters in the form factors, whereas the branching fractions exhibit only weak dependence. Using $P_{\psi}^N(4312)$ to calibrate the cutoff range, we further explore the spin assignments of $P_{\psi}^N(4440)$ and $P_{\psi}^N(4457)$. Our calculations favor the assignment where the lower-mass state $P_{\psi}^N(4440)$ carries higher spin $J = 3/2$ and the higher-mass state $P_{\psi}^N(4457)$ carries lower spin $J = 1/2$. In addition, the experimental widths of $P_{\psi s}^\Lambda(4338)$ and $P_{\psi s}^\Lambda(4459)$ can both be well reproduced under the molecular interpretation. We look forward to future experimental analyses with more accumulated data to clarify whether the lineshape of $P_{\psi s}^\Lambda(4459)$ contains contributions from both spin-$1/2$ and spin-$3/2$ states.

hep-ph↗

arXiv2024

Strong decays of the isovector-scalar $D^\ast\bar{D}^\ast$ hadronic molecule

We adopt the effective Lagrangian approach to study the strong decays of the $1^-(0^{++})$ $D^\ast\bar{D}^\ast$ molecular state [denoted as $T_{\psi0}^a(4010)$ according to the LHCb naming convention] through triangle diagrams. The decay channels include the open-charm $D\bar{D}$, and the hidden-charm $η_cπ$, $J/ψρ$, and $χ_{c1}π$. The coupling between the $T_{\psi0}^a(4010)$ and its constituents $D^\ast\bar{D}^\ast$ is obtained by solving for the residue of the scattering $T$-matrix at the pole. Our calculations yield a total width of few tens MeV for the $T_{\psi0}^a(4010)$ state using three different form factors, with its main decay channels being $η_cπ$ and $χ_{c1}π$. The $X(4100)$ and $X(4050)$ have similar masses and widths, with both masses being close to the $D^\ast\bar{D}^\ast$ threshold. Additionally, their decay final states are consistent with those of the $T_{\psi0}^a(4010)$. Therefore, it is likely that they represent the same state and both potentially correspond to the $T_{\psi0}^a(4010)$. We suggest that future experiments focus on searching for the $T_{\psi0}^a(4010)$ signal in the final states $η_cπ^-$, $χ_{c1}π^-$ and $D^0D^-$ of the $B^0\toη_cπ^-K^+$, $χ_{c1}π^- K^+$ and $D^0D^-K^+$ processes, respectively, as well as further investigating its resonance parameters with Flatté-like formula.

hep-ph↗