Very recently, three new structures $Ξ_c(2923)^0$, $Ξ(2938)^0$, and $Ξ(2964)^0$ at the invariant mass spectrum of $Λ_c^{+}K^{-}$ observed by the LHCb Collaboration triggers a hot discussion about their inner structure. In this work, we study the strong decay mode of the newly observed $Ξ_c$ assuming that the $Ξ_c$ is a $\bar{D}Λ-\bar{D}Σ$ molecular state. With the possible quantum numbers $J^p=1/2^{\pm}$ and $3/2^{\pm}$, the partial decay widths of the $\bar{D}Λ-\bar{D}Σ$ molecular state into the $Λ_c^{+}K^{-}$, $Σ_c^{+}K^{-}$,and $Ξ_c^{+}π^{-}$ final states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the $Ξ(2923)^0$ as $\bar{D}Λ-\bar{D}Σ$ molecule while the decay width of the $Ξ_c(2938)^0$ and $Ξ(2964)^0$ can not be well reproduced in the molecular state picture. In addition, the calculated partial decay widths with $S$ wave $\bar{D}Λ-\bar{D}Σ$ molecular state picture indicate that allowed decay modes, $Ξ_c^{+}π^{-}$, may have the biggest branching ratios for the $Ξ_c(2923)$. The experimental measurements for this strong decay process could be a crucial test for the molecule interpretation of the $Ξ_c(2923)$.
Molecular dynamics description of an expanding $q$/$\bar{q}$ plasma with the Nambu--Jona-Lasinio model and applications to heavy ion collisions at RHIC and LHC energies
Strong and radiative decays of DΞmolecular state and newly observed $Ω_c$ states
In this work, we study strong and radiative decays of S-wave DΞmolecular state, which is related to the Ω^*_c states newly observed at LHCb. The coupling between the DΞmolecular state and its constituents D and Ξis calculated by using the compositeness condition. With the obtained coupling, the partial decay widths of the DΞmolecular state into the Ξ_c^{+}K^{-}, Ξ^{'+}_cK^{-} and Ω^{*}_c(2695)γfinal states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the Ω^{*}_c(3119) o…
Signature of an $h_1$ state from $J/ψ\to ηK^{*0}\bar{K}^{*0}$ and theoretical description of the $Z_c(3900)$ and $Z_c(4020)$ as $D \bar D^*$ and $D^* \bar D^*$ molecular states
Magnetic dipole moment of the $Z_{cs}(3985)$ state: diquark-antidiquark and molecular pictures
我们计算了最近由BESIII合作组观测到的带电荷的隐粲开放奇异$ Z_{cs}(3985)^- $态的磁偶极矩。基于实验和理论研究提供的信息，我们对该态进行了量子数$ J^{P} = 1^{+}$和夸克组成$ c \bar c s\bar u $的赋值，并在紧致双夸克-反双夸克和分子图像中估计了该共振的磁偶极矩.我们应用光锥QCD形式，并使用不同扭曲的在壳层光子的分布振幅。在误差范围内，两幅图中获得的结果彼此一致。磁偶极矩的大小表明它在实验中是可接近的。
