Qi Huang

In this work, we investigate the interaction between the $Ω$ baryon and the $s\bar{s}$ meson within the framework of the quark delocalization color screening model. The spectra calculations show that no bound state is formed in any of the considered channels, while the scattering indicates that the $Ωφ$ interaction with $J^{P}=1/2^{-}$ is weakly attractive. As for the $Ωφ$ interactions with $J^{P}=3/2^{-}$ and $5/2^{-}$, as well as the $Ωη^{\prime}$ interaction with $J^{P}=3/2^{-}$, they are all repulsive. After an investigation on the femtoscopic correlation functions, we find that, due to the spin-averaging effect, the overall $Ωφ$ correlation function exhibits a weak dependence on the source size, which provides a crucial significance of our model for future experimental examinations in relativistic heavy-ion collisions.

Within the framework of the one-boson-exchange model, we systematically perform a coupled channel analysis of the $$P-$$ P - wave interactions between a charm baryon and light baryon, the involved channels include $$\Xi _cN$$ Ξ c N , $$\Lambda _c\Sigma $$ Λ c Σ , $$\Xi _c^{\prime }N$$ Ξ c ′ N , $$\Sigma _c\Lambda $$ Σ c Λ , $$\Xi _c^*N$$ Ξ c ∗ N , $$\Sigma _c^*\Lambda $$ Σ c ∗ Λ , $$\Sigma _c\Sigma $$ Σ c Σ , and $$\Sigma _c^*\Sigma $$ Σ c ∗ Σ . Our results can predict several possible molecular candidates, such as a $$\Xi _c^{\prime }N$$ Ξ c ′ N molecule with $$I(J^P)=0(1^-)$$ I ( J P ) = 0 ( 1 - ) , $$\Xi _c^{*}N$$ Ξ c ∗ N molecules with $$0(0^-, 1^-, 2^-)$$ 0 ( 0 - , 1 - , 2 - ) , $$\Sigma _c\Sigma $$ Σ c Σ molecules with $$0(1^-)$$ 0 ( 1 - ) and $$1(1^-)$$ 1 ( 1 - ) , and $$\Sigma _c^*\Sigma $$ Σ c ∗ Σ molecules with $$0(0^-, 1^-, 2^-)$$ 0 ( 0 - , 1 - , 2 - ) , and $$1(2^-)$$ 1 ( 2 - ) . The coupled channel effects significantly influence the formation of the $$\Sigma _c\Sigma $$ Σ c Σ molecule with $$1(1^-)$$ 1 ( 1 - ) . Furthermore, we analyze the phase shifts for these coupled channel systems. Our analysis not only confirms the existence of the predicted molecules but also identifies potential resonant dibaryons, including a $$\Sigma _c\Sigma $$ Σ c Σ shape-type resonance with $$1(1^-)$$ 1 ( 1 - ) , a $$\Sigma _c^*\Sigma $$ Σ c ∗ Σ shape-type resonance with $$1(0^-)$$ 1 ( 0 - ) , a $$\Lambda _c\Sigma /\Sigma _c\Sigma $$ Λ c Σ / Σ c Σ coupled Feshbach-type resonance with $$1(1^-)$$ 1 ( 1 - ) , and $$\Lambda _c\Sigma /\Sigma _c^*\Sigma $$ Λ c Σ / Σ c ∗ Σ coupled Feshbach-type resonances with $$1(0^-, 2^-)$$ 1 ( 0 - , 2 - ) .

This study investigates the three-body decay process $$B^{+} \rightarrow D^{*+} D^{-} K^{+}$$ B + → D ∗ + D - K + , aiming to explore the possible origins of $$T^{*}_{\bar{c}\bar{s}0}(2870)^0$$ T c ¯ s ¯ 0 ∗ ( 2870 ) 0 and $$\chi _{c1}(3872)$$ χ c 1 ( 3872 ) as intermediate states. Within the molecular state framework, $$T^{*}_{\bar{c}\bar{s}0}(2870)^0$$ T c ¯ s ¯ 0 ∗ ( 2870 ) 0 and $$\chi _{c1}(3872)$$ χ c 1 ( 3872 ) are considered as possible $$\bar{D}^{*}K^{*}$$ D ¯ ∗ K ∗ and $$D^{*}\bar{D}$$ D ∗ D ¯ molecular states, respectively. Using effective Lagrangians, the interaction kernels of the $$\bar{D}^{*}K^{*}$$ D ¯ ∗ K ∗ and $$D^{*}\bar{D}$$ D ∗ D ¯ systems are constructed within the one-boson-exchange model. The corresponding rescattering amplitudes and pole positions are obtained by solving the quasipotential Bethe–Salpeter equation. These amplitudes are incorporated into the decay amplitude of the three-body process, and the $$D^{-}K^{+}$$ D - K + and $$D^{*+}D^{-}$$ D ∗ + D - invariant mass spectra are simulated via Monte Carlo methods. To better reproduce the experimental data, additional Breit–Wigner contributions from $$T^{*}_{\bar{c}\bar{s}1}(2900)^0$$ T c ¯ s ¯ 1 ∗ ( 2900 ) 0 , $$\chi _{c1}(4010)$$ χ c 1 ( 4010 ) , and $$h_c(4300)$$ h c ( 4300 ) are included. The results show a pronounced enhancement near 2900 MeV in the $$D^{-}K^{+}$$ D - K + invariant mass spectrum, strongly supporting the interpretation of $$T^{*}_{\bar{c}\bar{s}0}(2870)^{0}$$ T c ¯ s ¯ 0 ∗ ( 2870 ) 0 as a $$\bar{D}^{*}K^{*}$$ D ¯ ∗ K ∗ molecular state. While the $$\bar{D}^{*}K^{*}$$ D ¯ ∗ K ∗ molecular state provides a reasonable contribution to the $$D^{-}K^{+}$$ D - K + spectrum, the $$D^{*}\bar{D}$$ D ∗ D ¯ molecular state yields no significant effect on either the $$D^{-}K^{+}$$ D - K + or $$D^{*+}D^{-}$$ D ∗ + D - distributions. This suggests that the observed $$\chi _{c1}(3872)$$ χ c 1 ( 3872 ) structure around 3872 MeV may not be interpreted as a $$D^{*}\bar{D}$$ D ∗ D ¯ molecular state.

Mass spectra and decay properties of the low-lying orbital excited $Ξ_c^{(\prime)}$ baryons are investigated in the framework of the chiral quark model and quark pair creation mechanism, which are mainly based on the recently experimental fact that $Ξ_c(3055)$ is a $D$-wave state excited in $λ$-mode. As a result, we make an inference that, (i) $Ξ_{c}(2790)$ and $Ξ_{c}(2815)$ are likely to be $λ$-mode excited $Ξ_{c1}(\frac{1}{2}^{-},1P)$ and $Ξ_{c1}(\frac{3}{2}^{-},1P)$ states, respectively. (ii) $Ξ_{c}(2923)$ and $Ξ_{c}(2939)$ could correspond respectively to the $Ξ_{c1}^{\prime}({\frac{1}{2}^{-}},1P)$ and $Ξ_{c2}^{\prime}({\frac{5}{2}^{-}},1P)$ states, while $Ξ_{c}(2965)$ might be a $ρ$-mode excited $Ξ_{c0}(\frac{1}{2}^{1},1P)$ state, and $Ξ_{c}(2882)$ might be arranged as $Ξ_{c0}^{\prime}(\frac{1}{2}^{-},1P)$. (iii) $Ξ_{c}(2970)$ might be the $Ξ_{c}(\frac{1}{2}^{+},2S)$ state. (iv) $Ξ_{c}(3055)$ and $Ξ_{c}(3080)$ can form a $λ$-mode excited $D$-wave doublet $Ξ_{c2}(\frac{3}{2}^+,\frac{5}{2}^+)$.

Inspired by the recent discovery of an pseudoscalar enhancement structure near the $t\bar{t}$ threshold reported by the CMS and ATLAS collaborations, this work investigates the mass spectra of single topped hadrons-including both topped mesons and topped baryons-based on a relativistic potential model. Our results show that, using the same parameters obtained from the fit to mesons and baryons, the calculated mass of pseudoscalar topponium is in excellent agreement with the observed enhancement structure, demonstrating the consistency and unifying power of the model. Accordingly, we provide predictions for the mass spectra of ground and low-lying orbitally excited single topped mesons and baryons, which may serve as a reference for future experimental searches for these possible new hadronic matter.

Within the framework of the one-boson-exchange model, we systematically perform a coupled channel analysis of the $P-$wave interactions between a charm baryon and light baryon, the involved channels include $Ξ_cN$, $Λ_cΣ$, $Ξ_c^{\prime}N$, $Σ_cΛ$, $Ξ_c^*N$, $Σ_c^*Λ$, $Σ_cΣ$, and $Σ_c^*Σ$. Our results can predict several possible molecular candidates, such as a $Ξ_c^{\prime}N$ molecule with $I(J^P)=0(1^-)$, $Ξ_c^{*}N$ molecules with $0(0^-, 1^-, 2^-)$, $Σ_cΣ$ molecules with $0(1^-)$ and $1(1^-)$, and $Σ_c^*Σ$ molecules with $0(0^-, 1^-, 2^-)$, and $1(2^-)$. The coupled channel effects significantly influence the formation of the $Σ_cΣ$ molecule with $1(1^-)$. Furthermore, we analyze the phase shifts for these coupled channel systems. Our analysis not only confirms the existence of the predicted molecules but also identifies potential resonant dibaryons, including a $Σ_cΣ$ shape-type resonance with $1(1^-)$, a $Σ_c^*Σ$ shape-type resonance with $1(0^-)$, a $Λ_cΣ/Σ_cΣ$ coupled Feshbach-type resonance with $1(1^-)$, and $Λ_cΣ/Σ_c^*Σ$ coupled Feshbach-type resonances with $1(0^-, 2^-)$.

Inspired by recent researches on the $p Ω$ and $p \barΛ$ systems, we investigate the $p \barΩ$ systems within the framework of a quark model. Our results show that the attraction between a nucleon and $\barΩ$ is slightly stronger than that between a nucleon and $Ω$, suggesting that the $p \barΩ$ system is more likely to form bound states. The dynamic calculations indicate that the $p \barΩ$ systems with both $J^{P}=1^{-}$ and $2^{-}$ can form bound states, with binding energies deeper than those of the $p Ω$ systems with $J^{P}=2^{+}$. The scattering phase shift and scattering parameter calculations also support the existence of $p \barΩ$ states. Additionally, we discuss the behavior of the femtoscopic correlation function for the $p \barΩ$ pairs for the first time. Considering the significant progress in experimental measurements of the correlation function of the $p Ω$ system, the further study of the $p \barΩ$ systems using femtoscopic techniques will be a very valuable work.

More and more excited baryons have been reported experimentally, but many properties are still unclear. This work attempts to simultaneously study the masses and strong decay widths of some singly heavy baryons, in order to provide possible quantum numbers for these states. The chiral quark model and the $^{3}P_{0}$ decay model are employed to calculate the masses and decay widths of $Λ_{c(b)}$ and $Σ_{c(b)}$ baryons for all quantum numbers with $2S$, $1P$, and $2P$ waves. We considered not only two-body strong decays but also the influence of three-body decays. Our calculations show that: (i) For states with experimentally determined quantum numbers, such as $Λ_c(2595)$, $Λ_c(2625)$, $Λ_b(5912)$ and $Λ_b(5920)$, the results are consistent with experimental data and the conclusions of most theoretical studies. (ii) For states whose quantum numbers have not yet been fully determined experimentally, we provide possible interpretations. For example, our calculations tend to interpret $Λ_c(2910)$ is interpreted as a $J^P=\frac{3}{2}^-$ state with 1P-wave $ρ$-mode or a $J^P=\frac{1}{2}^-$ state with 2P wave $λ$-mode. $Λ_c(2940)$ can be interpreted as the $J^P=\frac{3}{2}^-$ state with 2P-wave $λ$-mode. For $Λ_c(2860)$, we offer a different interpretation, proposing that its mass and width closely match those of a 2P-wave $J^P=\frac{1}{2}^{-}$ state. It is hoped that our calculations can provide valuable information for the experimental and theoretical studies of heavy baryons.