arXiv subjects

Jun-Tao Zhu

Publications and source records attributed to Jun-Tao Zhu.

12 recordsLinked to original sources

arXiv2025

Kaon-induced production of strange hidden-charm molecular pentaquarks $P^Λ_{ψs}$ from proton

In this work, we investigate the kaon-induced production of strange hidden-charm pentaquark $P^Λ_{ψs}$ states, including the $P^Λ_{ψs}(4459)$ and $P^Λ_{ψs}(4338)$ observed by the LHCb collaboration. Coupled-channel interactions involving the channels $\bar{K}N$, $Ξ_c^{(*)}\bar{D}^{(*)}$, $Ξ'_c\bar{D}^{(*)}$, $Λ_c\bar{D}_s^{(*)}$, and $ΛJ/ψ$ are studied using effective Lagrangians to describe these interactions. The potential kernels are constructed within the one-boson-exchange model and implemented into the quasipotential Bethe-Salpeter equation to calculate the scattering amplitudes. From these amplitudes, the partial-wave cross sections for kaon-induced production are predicted alongside the poles corresponding to strange hidden-charm molecular pentaquarks. The analysis reveals complex structures in the cross sections due to molecular states. A structure near the $Ξ_c\bar{D}$ threshold is predicted in the $Λ_c\bar{D}_s$ channel, corresponding to $P^Λ_{ψs}(4338)$. Both molecular states near the $Ξ_c\bar{D}^*$ threshold with $J^P = 1/2^-$ and $J^P = 3/2^-$, associated with $P^Λ_{ψs}(4459)$, produce peaks in the $Ξ'_c\bar{D}$ channel, which vary significantly with the cutoff. Additionally, a molecular state with $J^P = 3/2^-$ near the $Ξ_c^*\bar{D}$ threshold gives rise to a peak in the $Ξ_c\bar{D}^*$ channel. In the higher energy region, from 4350 to 4550 MeV, although the cross sections in the $Λ_c\bar{D}_s^{(*)}$ channels are substantial, no distinct structures corresponding to strange hidden-charm pentaquarks are identified, apart from some threshold-related cusps. These results provide valuable theoretical insights and serve as a foundation for future experimental studies of strange hidden-charm pentaquarks using kaon beams at J-PARC and JLab.

hep-ph↗

arXiv2024

Production of open-charm pentaquark molecules in decay $B^0 \rightarrow \bar{D}^0 p \bar{p}$

This study investigates the production of open-charm pentaquark molecular states, specifically $N\bar{D}^*$ and $\bar{N}\bar{D}^*$, within the $B^0 \rightarrow \bar{D}^0 p \bar{p}$ decay. We examine the invariant mass spectra of $p\bar{D}^0$ and $\bar{p}\bar{D}^0$, incorporating the rescattering process through a quasipotential Bethe-Salpeter equation approach. Our findings suggest the possible identification of the isoscalar $\bar{N}\bar{D}^*$ molecule with $3/2^+$ as the antiparticle partner of $Λ_c(2940)$ in the $\bar{p}\bar{D}^0$ mass spectrum. Although a molecular state near the $\bar{N}\bar{D}$ threshold with $1/2^-$ exists, its signal is weak, indicating that the $B^0 \rightarrow \bar{D}^0 p \bar{p}$ decay may not be ideal for its detection. A distinct signal of the isovector $N\bar{D}^*$ molecule with $1/2^-$ may appear in the $p\bar{D}^0$ invariant mass spectrum, while the signal for the $3/2^-$ state remains very weak. We emphasize the importance of the three-body decay of the bottom meson as a valuable method for studying open-charm molecules and advocate for increased attention and more precise experimental measurements of the $B^0 \rightarrow \bar{D}^0 p \bar{p}$ decay.

hep-ph↗

arXiv2023

Possible molecular dibaryons with $csssqq$ quarks and their baryon-antibaryon partners

In this work, we systematically investigate the charmed-strange dibaryon systems with $csssqq$ quarks and their baryon-antibaryon partners from the interactions $Ξ^{(',*)}_{c}Ξ^{(*)}$, $Ω^{(*)}_cΛ$, $Ω^{(*)}_cΣ^{(*)}$, $Λ_cΩ$ and $Σ^{(*)}_cΩ$ and their baryon-antibaryon partners from interactions $Ξ^{(',*)}_{c}\barΞ^{(*)}$, $Ω^{(*)}_c\barΛ$, $Ω^{(*)}_c\barΣ^{(*)}$, $Λ_c\barΩ$ and $Σ^{(*)}_c\barΩ$. The potential kernels are constructed with the help of effective Lagrangians under SU(3), heavy quark, and chiral symmetries to describe these interactions. To search for possible molecular states, the kernels are inserted into the quasipotential Bethe-Salpeter equation, which is solved to find poles from scattering amplitude. The results suggest that 36 and 24 bound states can be found in the baryon-baryon and baryon-antibaryon interactions, respectively. However, much large values of parameter $α$ are required to produce the bound states from the baryon-antibaryon interactions, which questions the existence of these bound states. Possible coupled-channel effect are considered in the current work to estimate the couplings of the molecular states to the channels considered.

hep-ph↗

arXiv2023

$P^Λ_{ψs}(4459)$ and $P^Λ_{ψs}(4338)$ as molecular states in $ J/ψΛ$ invariant mass spectra

Recently, the LHCb Collaboration has reported two strange hidden-charm pentaquark states named $P^Λ_{ψs}(4459)$ and $P^Λ_{ψs}(4338)$ in the $ J/ψΛ$ invariant mass spectra of decays $Ξ_b^-$$\to$$ J/ψΛK^-$ and $B^-$$\to$$J/ψΛ\bar{p}$,respectively. In this work, we perform a coupled-channel study of the interactions $Ξ_c^*\bar{D}^*$, $Ξ'_c\bar{D}^*$, $Ξ^*_c\bar{D}$, $Ξ_c\bar{D}^*$, $Ξ'_c\bar{D}$, $Λ_c\bar{D}_s^{*}$, $Ξ_c\bar{D}$, $Λ_c\bar{D}_s$, and $ΛJ/ψ$ in the quasipotential Bethe-Salpeter equation approach to estimate the $ J/ψΛ$ invariant mass spectra. With the help of effective Lagrangians, the potential kernel can be constructed by meson exchanges to obtain the scattering amplitudes, from which the poles of the bound states and the invariant mass spectra can be reached. The coupled-channel calculation results in that the width of state $Ξ_c\bar{D}^{*}(1/2^-)$ is about $18$~MeV and that of state $Ξ_c\bar{D}^{*}(3/2^-)$ is only about $1.6$~MeV. By comparison with experimental data, it indicates that the structure $P^Λ_{ψs}(4459)$ is mainly from the contribution from the $Ξ_c \bar{D}^{*}(1/2^-)$ state while the role of state $Ξ_c \bar{D}^{*}(3/2^-)$ cannot be excluded. The line shape of the structure $P^Λ_{ψs}(4338)$ can be reproduced roughly by a narrow molecular state from the $Ξ_c \bar{D}$ interaction with $J^P$=$1/2^-$, which is extremely close to the threshold, with a large interference effect. Besides, an additional state $Ξ'_c \bar{D}(1/2^-)$ is suggested to be observed as a dip structure in the $J/ψΛ$ invariant mass spectrum.

hep-ph↗

arXiv2023

Possible $Λ_c\barΛ_c$ molecular states and their productions in nulceon-antinulceon collision

In this work, a study of possible molecular states from the $Λ_c\barΛ_c$ interaction and their productions in nucleon-antinucleon collision is performed in a quasipotential Bethe-Salpeter equation approach. Two bound states with quantum numbers $J^{PC}=0^{-+}$ and $1^{--}$ are produced with almost the same binding energy from the $Λ_c\barΛ_c$ interaction which is described by the light meson exchanges. However, the result does not support the assignment of experimentally observed $Y(4630)$ as a $Λ_c\barΛ_c$ molecular state because it is hard to obtain a peak near experimental mass of the $Y(4630)$ which is far above the $Λ_c\barΛ_c$ threshold. The possibility to search these states in nucleon-antinucleon collision is studied by including couplings to $N\bar{N}$ and $D^{(*)}\bar{D}^{(*)}$ channels. The peaks can be found obviously near the $Λ_c\barΛ_c$ threshold in the $D^*\bar{D}^*$ channel at an order of amplitude of 10 $μ$b. Too small width of state with $0^{-+}$ may lead to the difficulty to be observed in experiment. Based on the results in the current work, search for the $Λ_c\barΛ_c$ molecular state with $1^{--}$ is suggested in process $N\bar{N}\to D^*\bar{D}^*$, which is accessible at $\rm \bar{P}ANDA$.

hep-ph↗

arXiv2023

Possible charmed-strange molecular dibaryons

In this work, we systematically investigate the dibaryons with charm number $C$=1 and strangeness number $S$=$\pm$ 1 from the interactions of a charmed baryon and a strange baryon $Λ_cΛ$, $Λ_cΣ^{(*)}$, $Σ_c^{(*)}Λ$, and $Σ^{(*)}_cΣ^{(*)}$, and corresponding interactions of a charmed baryon and an antistrange baryon $Λ_c\barΛ$, $Λ_c\barΣ^{(*)}$, $Σ^{(*)}_c\barΛ$, and $Σ^{(*)}_c\barΣ^{(*)}$. With the help of the effective Lagrangians with $SU(3)$, heavy quark, and chiral symmetries, the potentials of the interactions considered are constructed by light meson exchanges. To search for the possible molecules, the quasipotential Bethe-Salpeter equation with the interaction potential kernel is solved to find poles from scattering amplitude. The results suggest that attractions widely exist in charmed-strange system with $C$=1 and $S$=$-1$. The $S$-wave bound states can be produced from most of the channels. Few bound states are also produced from the charmed-antistrange interactions. Couple-channel effect are considered in the current work to discuss the couplings of the molecular states to the channels considered. More experimental research for these charmed-strange dibaryons are suggested.

hep-ph↗

arXiv2022

Systematical study of $Ω_c$-like molecular states from interactions $Ξ_c^{(',)}\bar{K}^{()}$ and $Ξ^{()}D^{()}$

In this work, the $Ω_c$-like molecular states are systematically investigated in a quasipotential Bethe-Salpeter equation approach. The relevant interactions $Ξ_c^{(*,')}\bar{K}^{(*)}$, $Ξ^{(*)}D^{(*)}$, and $Ω^{(*)}_c(π/η/ρ/ω)$ are described by light meson exchanges with the help of the effective Lagrangians with SU(3), chiral, and heavy quark symmetries. The obtained potential kernels of considered interactions are inserted into the quasipotential Bethe-Salpeter equation, and coupled-channel calculations are performed to find possible molecular states and its couplings to the channels considered. The results suggest that an isoscalar state can be produced from the $Ξ^*_c\bar{K}$ interaction with spin parity $3/2^-$, which can be related to state $Ω_c(3120)$. And its isoscalar partner is predicted with a dominant decay in the $Ω_c^*π$ channel. The isoscalar and isovector states with $1/2^-$ can be produced from the $Ξ'_c\bar{K}$ interaction with a threshold close to the mass of the $Ω_c(3050)$ and $Ω_c(3065)$. Their couplings to the $Ξ_c \bar{K}$ channel are very weak, and the isovector one has strong coupling to $Ω_cπ$. High precision measurement is helpful to confirm or search such molecular states. Experimental search of states with higher masses generated from interactions $Ξ^{(*,')}_c \bar{K}^*$ and $Ξ^* D^{(*)}$ are also suggested by the current results.

hep-ph↗

arXiv2021

$P_{cs}(4459)$ and other possible molecular states from $Ξ_{c}^{()}\bar{D}^{()}$ and $Ξ'_c\bar{D}^{(*)}$ interactions

Recently, the LHCb Collaboration reported a new structure $P_{cs}(4459)$ with a mass of 19 MeV below the $Ξ_c \bar{D}^{*} $ threshold. It may be a candidate of molecular state from the $Ξ_c \bar{D}^{*} $ interaction. In the current work, we perform a coupled-channel study of the $Ξ_c^*\bar{D}^*$, $Ξ'_c\bar{D}^*$, $Ξ^*_c\bar{D}$, $Ξ_c\bar{D}^*$, $Ξ'_c\bar{D}$, and $Ξ_c\bar{D}$ interactions in the quasipotential Bethe-Salpeter equation approach. With the help of the heavy quark chiral effective Lagrangian, the potential is constructed by light meson exchanges. Two $Ξ_c \bar{D}^{*} $ molecular states are produced with spin parities $ J^P=1/2^-$ and $3/2^- $. The lower state with $3/2^-$ can be related to the observed $P_{cs}(4450)$ while two-peak structure cannot be excluded. Within the same model, other strange hidden-charm pentaquarks are also predicted. Two states with spin parities $1/2^-$ and $3/2^-$ are predicted near the $Ξ'_c\bar{D}$, $Ξ_c\bar{D}$, and $Ξ_c^*\bar{D}$ thresholds, respectively. As two states near $Ξ_c \bar{D}^{*}$ threshold, two states are produced with $1/2^-$ and $3/2^-$ near the $Ξ'_c\bar{D}^*$ threshold. The couplings of the molecular states to the considered channels are also discussed. The experimental research of those states are helpful to understand the origin and internal structure of the $P_{cs}$ and $P_c$ states.

hep-ph↗

arXiv2021

Heavy-strange meson molecules and possible candidates $D^*_{s0}(2317)$, $D_{s1}(2460)$, and $X_0(2900)$

In this work, we systematically investigate the heavy-strange meson systems, $D^{(*)}K^{(*)}/\bar{B}^{(*)}K^{(*)}$ and $\bar{D}^{(*)}K^{(*)}/B^{(*)}K^{(*)}$, to study possible molecules in a quasipotenial Bethe-Salpter equation approach together with the one-boson exchange model. The potential is achieved with the help of the hidden-gauge Lagrangians. Molecular states are found from all six $S$-wave isoscalar interactions of $D^{(*)}K^{(*)}$ or $\bar{B}^{(*)}K^{(*)}$. The charmed-strange mesons $D^*_{s0}(2317)$ and $D_{s1}(2460)$ can be related to the ${D}K$ and $D^*K$ states with spin parities $0^+$ and $1^+$, respectively. In the current model, the $\bar{B}K^*$ molecular state with $1^+$ is the best candidate of the recent observed $B_{sJ}(6158)$. Four molecular states are produced from the interactions of $\bar{D}^{(*)}K^{(*)}$ or $B^{(*)}K^{(*)}$. The relation between the $\bar{D}^*{K}^*$ molecular state with $0^+$ and the $X_0(2900)$ is also discussed. No isovector molecular states are found from the interactions considered. The current results are helpful to understand the internal structure of $D^*_{s0}(2317)$, $D_{s1}(2460)$, $X_0(2900)$, and new $B_{sJ}$ states. The experimental research for more heavy-strange meson molecules is suggested.

hep-ph↗

arXiv2020

Hidden-bottom molecular states from $Σ^{()}_bB^{()}-Λ_bB^{(*)}$ interaction

In this work, we study possible hidden-bottom molecular pentaquarks $P_b$ from coupled-channel $Σ^{(*)}_bB^{(*)}-Λ_bB^{(*)}$ interaction in the quasipotential Bethe-Salpeter equation approach. In isodoublet sector with $I=1/2$, with the same reasonable parameters the interaction produces seven molecular states, a state near $ Σ_bB$ threshold with spin parity $J^P=1/2^-$, a state near $Σ^*_bB$ threshold with $3/2^-$, two states near $Σ_bB^*$ threshold with $1/2^-$ and $3/2^-$, and three states near $Σ_b^*B^*$ threshold with $1/2^-$, $3/2^-$, and $5/2^-$. The results suggest that three states near $Σ_b^* B^*$ threshold and two states near $Σ_b B^*$ threshold are very close, respectively, which may be difficult to distinguish in experiment without partial wave analysis. Compared with the hidden-charm pentaquark, the $P_b$ states are relatively narrow with widths at an order of magnitude of 1 MeV or smaller. The importance of each channel considered is also discussed, and it is found that the $Λ_b B^*$ channel provides important contribution for the widths of those states. In isoquartet sector with $I=3/2$, cutoff should be considerably enlarged to achieve bound states from the interaction, which makes the existence of such states unreliable. The results in the current work are helpful for searching for hidden-bottom molecular pentaquarks in future experiments, such as the COMPASS, J-PARC, and the Electron Ion Collider in China (EicC).

hep-ph↗

arXiv2020

The $X(2239)$ and $η(2225)$ as hidden-strange molecular states from $Λ\barΛ$ interaction

In this work, we propose a possible assignment of the newly observed $X(2239)$, as well as the $η(2225)$, as a molecular state from the interaction of a baryon $Λ$ and an antibaryon $\barΛ$. With the help of effective Lagrangians, the $Λ\barΛ$ interaction is described within the one-boson-exchange model with $η$, $η'$, $ω$, $ϕ$, and $σ$ exchanges considered. After inserting the potential kernel into the quasipotential Bethe-Salpeter equation, the bound states from the $Λ\barΛ$ interaction can be studied by searching for the pole of the scattering amplitude. Two loosely bound states with spin parities $I^G(J^{PC})=0^+(0^{-+})$ and $0^-(1^{--})$ appear near the threshold almost with the same parameter. The $0^-(1^{--})$ state can be assigned to the $X(2239)$ observed at BESIII, which is very close to the $Λ\barΛ$ threshold. The scalar meson $η(2225)$ can be interpreted as a $0^+(0^{-+})$ state from the $Λ\barΛ$ interaction. The annihilation effect is also discussed through a coupled-channel calculation plus a phenomenological optical potential. It provides large widths to two bound states produced from the $Λ\barΛ$ interaction. The mass of the $1^-$ state is a little larger than the mass of the $0^-$ state after including the annihilation effect, which is consistent with our assignment of these two states as $X(2239)$ and $η(2225)$, respectively. The results suggest that further investigation is expected to understand the structures near the $Λ\barΛ$ threshold, such as $X(2239)$, $η(2225)$, and $X(2175)$.

hep-ph↗

arXiv2020

Y(4626) as a molecular state from interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$

Recently, a new structure $Y(4626)$ was reported by the Belle Colloboration in the process $e^+e^-\to D_s^+D_{s1}(2536)^-$. In this work, we propose an assignment of the $Y(4626)$ as a ${D}^*_s\bar{D}_{s1}(2536)$ molecular state, which decays into the $D_s^+D_{s1}(2536)^-$ channel through a coupling between ${D}^*_s\bar{D}_{s1}(2536)$ and ${D}_s\bar{D}_{s1}(2536)$ channels. With the help of the heavy quark symmetry, the potential of the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$ is constructed within the one-boson-exchange model, and inserted into the quasipotential Bethe-Salpeter equation. The pole of obtained scattering amplitude is searched for in the complex plane, which corresponds to a molecular state from the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$. The results suggest that a pole is produced near the ${D}^*_s\bar{D}_{s1}(2536)$ threshold, which exhibits as a peak in the invariant mass spectrum of the ${D}_s\bar{D}_{s1}(2536)$ channel at about 4626 MeV. It obviously favors the $Y(4265)$ as a ${D}^*_s\bar{D}_{s1}(2536)$ molecular state. In the same model, other molecular states from the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$ are also predicted, which can be checked in future experiments.

hep-ph↗