arXiv subjects

Xiu-Wu Wang

Publications and source records attributed to Xiu-Wu Wang.

13 recordsLinked to original sources

arXiv2026

The $Λ_cΣ_c$ dibaryon and $\barΛ_cΣ_c\pm \barΣ_cΛ_c$ baryonium states via the QCD sum rules

In the present work, we study the $Λ_cΣ_c$ dibaryon and $\barΛ_cΣ_c\pm \barΣ_cΛ_c$ baryonium states via the QCD sum rules. We construct four (eight) currents with definite $J^P$ ($J^{PC}$) to interpolate the dibaryon (baryonium) states and obtain twelve QCD sum rules. For the dibaryon states, the state with the $J^P=1^+$ lies below the $Λ_cΣ_c$ threshold, and is a molecule candidate. For the baryonium states, the states with the $J^P=0^{-\pm}$ and $1^{-\pm}$ lie below the $\barΛ_cΣ_c$ threshold, and are four molecule candidates. The present predictions can be confronted to the experimental data in the future and make contributions to the exotic spectroscopy.

hep-ph↗

arXiv2026

Could $\barΛ_c$ and $Λ_c$ form bound hadronic molecule with explicit $P-wave$ ?

In this article, the explicit $P-wave$ of the $\barΛ_cΛ_c$ dibaryon states with the $J^{PC}=0^{-\pm}$ and $1^{-\pm}$ are studied via twelve interpolated currents. Results show that the positive and negative charge conjugations for the studied states do not have too much difference, the contribution of the gluon from covariant derivative of the current with $P-wave$ could be neglected. The numerical results of the masses of the $P-wave$ $\barΛ_cΛ_c$ are high above the threshold of the two $\barΛ_c$ and $Λ_c$ baryon constituents, $\barΛ_c$ and $Λ_c$ are unlikely to form the bound molecules with explicit $P-wave$ . Pole residues of the related states are also calculated.

hep-ph↗

arXiv2026

Systematic study of the strong decays of the $P_c$ states and their possible isospin cousins via the QCD sum rules

In the present work, the strong decays of the discovered $P_c(4380)$, $P_c(4440)$, $P_c(4457)$ and their possible isospin cousins are systematically studied via the assignment that they are the meson-baryon molecular states. In detail, the strong decay constants, partial decay widths of their decay channels are calculated under the framework of QCD sum rules. The decay withes of the discovered $P_c(4380)$, $P_c(4440)$ and $P_c(4457)$ are in good agreement with the experiments. The predictions of the decays of these three related possible isospin cousins are presented which would shed light for their findings in experiment, in return, this may testify the assignments of the discovered $P_c$ states.

hep-ph↗

arXiv2024

Strong decays of the $P_{cs}(4338)$ and its high isospin cousin via the QCD sum rules

In the present work, the strong decays of the newly observed $P_{cs}(4338)$ as well as its high isospin cousin $P_{cs}(4460)$ are studied via the QCD sum rules. According to conservation of isospin, spin and parity, the hadronic coupling constants in four decay channels are obtained, then the partial decay widths are obtained. The total width of the $P_{cs}(4338)$ coincides with the experimental data nicely, while the predictions for the $P_{cs}(4460)$ can be testified in the future experiment, and shed light on the nature of the $P_{cs}(4338)$.

hep-ph↗

arXiv2024

Doubly-Charm and Doubly-Bottom Pentaquark molecular States via the QCD sum rules

In the present work, the doubly-charm and doubly-bottom pentaquark molecular states $D^{(*)}Σ_c^{(*)}$ and $B^{(*)}Σ_b^{(*)}$ are studied via the QCD sum rules. Sixteen color singlet-singlet type currents with the definite isospin-spin-parity $IJ^P$ are constructed to interpolate the corresponding hadronic states with the same quantum numbers. The masses and pole residues of those doubly-heavy pentaquark molecular states are calculated, the results show that their masses are all below the corresponding meson-baryon thresholds, which means that they are possible bound states, not resonant states, moreover, the possible decay channels for the doubly-charm molecular states are given.

hep-ph↗

arXiv2024

Strong decays of the $P_c(4312)$ and its isospin cousin via the QCD sum rules

In the present work, considering the conservation of isospin in the strong decays, we investigate the strong decays of the pentaquark molecule candidate $P_c(4312)$ and its possible higher isospin cousin $P_c(4330)$ in the framework of the QCD sum rules. What's more, the pole residue of the $Δ$ baryon with isospin eigenstate $|II_3\rangle=|\frac{3}{2}\frac{1}{2}\rangle$ is obtained. If the possible pentaquark molecule candidate $P_c(4330)$ could be testified in the future experiment, it would shed light on interpretations of the $P_c$ states.

hep-ph↗

arXiv2022

Study of isospin eigenstates of the pentaquark molecular states with strangeness

In the paper, we construct eight color singlet-singlet type five-quark currents with distinguished isospins to study the $\bar{D}Ξ^{\prime}$, $\bar{D}Ξ_c^{*}$, $\bar{D}^{*}Ξ_c^{\prime}$ and $\bar{D}^{*}Ξ_c^{*}$ molecular states with strangeness via the QCD sum rules. Numerical results show that the central values of the pentaquark masses with higher (lower) isospin are slightly above (below) the thresholds of the corresponding meson-baryon pairs, and support assigning the $P_{cs}(4459)$ as the $\bar{D}Ξ_c^{*}$ molecular state with the quantum numbers $IJ^P=0{\frac{3}{2}}^-$. The other predictions can be confronted to the experimental data in the future.

hep-ph↗

arXiv2022

Analysis of the $P_{cs}(4338)$ and related pentaquark molecular states via the QCD sum rules

In this work, we tentatively identify the $P_{cs}(4338)$ as the $\bar{D}Ξ_c$ molecular state, and distinguish the isospins of the current operators to explore the $\bar{D}Ξ_c$, $\bar{D}Λ_c$, $\bar{D}_sΞ_c$, $\bar{D}_sΛ_c$, $\bar{D}^*Ξ_c$, $\bar{D}^*Λ_c$, $\bar{D}^*_sΞ_c$ and $\bar{D}^*_sΛ_c$ molecular states without strange, with strange and with double strange in the framework of the QCD sum rules in details. The present explorations favor identifying the $P_{cs}(4338)$ ($P_{cs}(4459)$) as the $\bar{D}Ξ_c$ ($\bar{D}^*Ξ_c$) molecular state with the spin-parity $J^P={\frac{1}{2}}^-$ (${\frac{3}{2}}^-$) and isospin $(I,I_3)=(0,0)$, the observation of their cousins with the isospin $(I,I_3)=(1,0)$ in the $J/ψΣ^0/η_cΣ^0$ invariant mass distributions would decipher their inner structures.

hep-ph↗

arXiv2022

Search for the charmed baryonium and dibaryon structures via the QCD sum rules

In the present work, we construct eight six-quark currents to study the $Σ_c\barΣ_c$ baryonium and $Σ_cΣ_c$ dibaryon states via the QCD sum rules. For either $Σ_c\barΣ_c$ baryonium or $Σ_cΣ_c$ dibaryon states, we construct four currents with the $J^P=1^-, 1^+, 0^+$ and $0^-$. Except the current $1^+$ of $Σ_cΣ_c$, we find the Borel windows for the other seven. There are two possible $Σ_c\barΣ_c$ molecular states or compact six-quark states with the $J^P=1^-$ and $0^-$. The results of the current $0^+$ of $Σ_cΣ_c$ show a possible $Σ_cΣ_c$ molecular state with $20$ MeV binding energy. We find two $Σ_c\barΣ_c$ baryonium resonances states with the $J^P=1^+, 0^+$ and two $Σ_cΣ_c$ dibaryon resonances states with the $J^P=0^-, 1^-$, respectively. Pole residues of the seven states are also calculated.

hep-ph↗

arXiv2022

Isospin eigenstates of the color singlet-singlet type pentaquark states

In this article, we construct the color singlet-singlet type five-quark currents with the isospins $(I,I_3)=(\frac{1}{2},\frac{1}{2})$ and $(\frac{3}{2},\frac{1}{2})$ unambiguously to explore the $\bar{D}Σ_c$, $\bar{D}Σ_c^*$, $\bar{D}^*Σ_c$ and $\bar{D}^*Σ_c^*$ pentaquark states via the QCD sum rules for the first time, where the $\bar{D}$, $Σ_c$, $\cdots$ represent the color-singlet clusters having the same quantum numbers as the corresponding physical mesons or baryons. The numerical results support assigning the $P_c(4312)$, $P_c(4380)$, $P_c(4440)$ and $P_c(4457)$ as the $\bar{D}Σ_c$, $\bar{D}Σ_c^*$, $\bar{D}^*Σ_c$ and $\bar{D}^*Σ_c^*$ pentaquark states with the isospin $I=\frac{1}{2}$, respectively. The corresponding $\bar{D}Σ_c$, $\bar{D}Σ_c^*$, $\bar{D}^*Σ_c$ and $\bar{D}^*Σ_c^*$ pentaquark states with the isospin $I=\frac{3}{2}$ have slightly larger masses, the observations of the higher pentaquark candidates in the $J/ψΔ$ invariant mass spectrum would shed light on the nature of the $P_c$ states, and make contributions in distinguishing the scenarios of color antitriplet-antitriplet-antitriplet type and color singlet-singlet type pentaquark states.

hep-ph↗

arXiv2021

The $1D$, $2D$ $Ξ_{b}$ and $Λ_{b}$ baryons

Recently, scientists have made great progresses in experiments in searching for the excited states of $Ξ_{b}$ and $Λ_{b}$ baryons such as the $Λ_{b}(6072)$, $Λ_{b}(6146)$, $Λ_{b}(6152)$, $Ξ_{b}(6227)$, $Ξ_{b}(6100)$, $Ξ_{b}(6327)$ and $Ξ_{b}(6333)$. Stimulated by these progresses, we give a systematical analysis about the $1D$ and $2D$ states of $Ξ_{b}$ and $Λ_{b}$ baryons with the method of QCD sum rules. By constructing three types of interpolating currents, we calculate the masses and pole residues of these heavy baryons with different excitation modes $(L_ρ,L_λ)=(0,2)$, $(2,0)$ and $(1,1)$. As a result, we decode the inner structures of $Λ_{b}(6146)$, $Λ_{b}(6152)$, $Ξ_{b}(6327)$ and $Ξ_{b}(6333)$, and favor assigning these states as the $1D$ baryons with the quantum numbers $(L_ρ,L_λ)=(0,2)$ and $\frac{3}{2}^{+}$, $\frac{5}{2}^{+}$, $\frac{3}{2}^{+}$ and $\frac{5}{2}^{+}$, respectively. In addition, the predictions about the masses and pole residues of the other $1D$ and $2D$ states of $Ξ_{b}$ and $Λ_{b}$ baryons in this paper are helpful in studying the D-wave bottom baryons in experiments in the future.

hep-ph↗

arXiv2021

Study of $Λ_c$$Λ_c$ dibaryon and $Λ_c$$\barΛ_c$ baryonium states via QCD sum rules

In this article, we construct the six-quark currents with the $J^P=0^+$, $0^-$, $1^+$ and $1^-$ to study the $Λ_c$$Λ_c$ dibaryon and $Λ_c$$\barΛ_c$ baryonium states via QCD sum rules. We consider the vacuum condensates up to dimension 16 and truncation of the order $\mathcal{O}(α_s^k )$ with $k\leq3$. The predicted masses are $5.11_{-0.12}^{+0.15}$GeV, $4.66_{-0.06}^{+0.10}$GeV, $4.99_{-0.09}^{+0.10}$GeV $4.68^{+0.08}_{-0.08}$GeV for the $J^P=0^+$, $0^-$, $1^+$ and $1^-$ states, respectively, which can be confronted to the experimental data in the future considering the high integrated luminosity at the center-of-mass energy about $4.8\,\rm{GeV}$ at the BESIII. We find the terms with $\frac{3}{2}< k \leq 3$ do play a tiny role, and we can ignore these terms safely in the QCD sum rules.

hep-ph↗

arXiv2021

The ground states and the first radially excited states of D-wave vector $ρ$ and $ϕ$ mesons

In this article, we firstly derive two QCD sum rules QCDSR I and QCDSR II which are respectively used to extract observable quantities of the ground states and the first radially excited states of D-wave vector $ρ$ and $ϕ$ mesons. In our calculations, we consider the contributions of vacuum condensates up to dimension-7 in the operator product expansion. The predicted masses for $1^{3}D_{1}$ $ρ$ meson and $2^{3}D_{1}$ $ϕ$ meson are consistent well with the experimental data of $ρ$($1700$) and $ϕ$($2170$). Besides, our analysis indicates that it is reliable to assign the recent reported $Y$($2040$) state as the $2^{3}D_{1}$ $ρ$ meson. Finally, we obtain the decay constants of these states with QCDSR I and QCDSR II. These predictions are helpful not only to reveal the structure of the newly observed $Y$($2040$) state but also to establish $ϕ$ meson and $ρ$ meson families.

hep-ph↗