arXiv subjects

Dian-Yong Chen

Publications and source records attributed to Dian-Yong Chen.

At least 37 records · Page 2Linked to original sources

arXiv2025

Analysis of the semileptonic decays $Λ_b\toΛ_cl\barν_l$ and $Ξ_b\toΞ_cl\barν_l$ in QCD sum rules

In this article, the electroweak transition form factors of $Λ_b\toΛ_c$ and $Ξ_b\toΞ_c$ are analyzed within the framework of three-point QCD sum rules. In phenomenological side, all possible couplings of interpolating current to hadronic states are considered. In QCD side, the perturbative part and the contributions of vacuum condensates up to dimension 8 are also included. With the estimated form factors, we study the decay widths and branching ratios of semileptonic decays $Λ_b\toΛ_cl\barν_l$ and $Ξ_b\toΞ_cl\barν_l$ ($l=e,μ$ and $τ$). Our results for the branching ratios of $Λ_b\toΛ_cl\barν_l$ are comparable with experimental data and the results from other collaborations. In addition, our prediction for the branching ratio of $Ξ_b\toΞ_cl\barν_l$ can provide a valuable reference for future experimental measurements.

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arXiv2025

Exploring pion emission properties of (strange) hidden-charm molecular pentaquarks in a chiral quark model

The internal structure of the exotic $P_c$ and $P_{cs}$ pentaquarks remains an open question. To address this, we demonstrate that pion emission serves as a sensitive probe by calculating its properties within a molecular scenario using the chiral quark model and coupled-channel effects. Our results reveal a strong dependence of the decay widths on the internal structure and spatial wave functions. We therefore expect this study to stimulate experimental measurements of these decays, which are crucial for determining the nature of these states and guiding the search for further molecular partners.

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arXiv2025

The $B^-\to J/ψη^\prime K^-$ reaction and the $Y(4710)$ and $K_0^*(1430)$ contributions

Motivated by the recent LHCb Collaboration analysis, we have investigated the process $B^-\to J/ψη^\prime K^-$ by considering the contributions from the resonances $Y(4710)$ and $K_0^*(1430)$. Our results are in good agreement with the measured invariant mass distributions and the Dalitz plot of LHCb, which supports the existence of the $K_0^*(1430)$ and the $Y(4710)$ in the process $B^-\to J/ψη^\prime K^-$. Since the decay mode of $Y(4710)\to J/ψη'$ is Okubo-Zweig-Iizuka (OZI) suppressed for the charmonium state, the measurements of the $\mathcal{B}(Y(4710)\to J/ψη')$ through the process $B^-\to J/ψη' K^-$ or other processes is helpful to understanding the nature of the $Y(4710)$. Thus, we advocate that Belle~II and LHCb Collaborations could perform the more precise analysis to confirm the evidence of the $Y(4710)$ state, which could be helpful to reduce the experimental uncertainties of its mass and width, and to explore its nature.

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arXiv2025

Strong decays of the $DK^\ast$ and $\bar{D}K^{\ast}$ molecular states

Inspired by the abundant structure near the threshold of the $D^{(*)}K^{(*)}/\bar{D}^{(*)}K^{(*)}$, we estimate the strong decay properties of the $T_{c\bar{s}1}^{f/a}$ and $T_{\bar{c}\bar{s}1}^{f/a}$ with $I(J^{P})=0/1(1^{+})$ in $DK^{*}$ and $\bar{D}K^{*}$ molecular scenarios in the present paper. By employing the effective Lagrangian approach, the widths of the processes $T_{c\bar{s}1}^{f}\to D^{*}K, D_{s}^{*}η, DKπ$, $T_{c\bar{s}1}^{a}\to D^{*}K, D_{s}^{*}π, DKπ$, and $T_{\bar{c}\bar{s}1}^{f/a}\to\bar{D}^{*}K, \bar{D}Kπ$ are estimated. Considering the present estimations, we propose to search for $T_{c\bar{s}1}^{f/a}$ states in $D^{*}K$ and $D_{s}^{*}π/D_{s}^{*}η$ mass invariant spectra. Their ratios may serve as an important test of the molecular scenario.

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arXiv2025

Analysis of the strong vertices $Λ_cD^{()}N^(1535)$ and $Λ_bB^{()}N^(1535)$ in QCD sum rules

In this article, we firstly analyze the mass and pole residue of negative parity nucleon $N^*(1535)$ within the two-point QCD sum rules. Basing on these results, we continuously study the strong coupling constants of vertices $Λ_cDN^*$, $Λ_cD^*N^*$, $Λ_bBN^*$ and $Λ_bB^*N^*$ in the framework of three-point QCD sum rules. At hadron side, all possible couplings of interpolating current to hadronic states are considered. At QCD side, the contributions of vacuum condensate terms $\langle\bar{q}q\rangle$, $\langle g_s^2GG\rangle$, $\langle\bar{q} g_sσGq\rangle$, $\langle\bar{q}q\rangle^2$ and $g_s^2\langle\bar{q}q\rangle^2$ are also considered. By setting the four momentum of $D^{(*)}[B^{(*)}]$ mesons off-shell, the strong coupling constants in deep space-like regions ($Q^2=-q^2\ggΛ_{QCD}^2$) are obtained. Then, the momentum dependent coupling constants in space-like regions are fitted into analytical function $G(Q^2)$ and are extrapolated into time-like regions ($Q^2<0$). Finally, the on-shell values of strong coupling constants are obtained by taking $Q^{2}=-m_{D^{(*)}[B^{(*)}]}^2$. The results are $G_{Λ_cDN^*}(Q^2=-m_D^2)=4.06^{+0.96}_{-0.75}$, $f_{Λ_cD^*N^*}(Q^2=-m_{D^*}^2)=3.73^{+0.68}_{-0.16}$, $g_{Λ_cD^*N^*}(Q^2=-m_{D^*}^2)=9.22^{+3.16}_{-0.36}$, $G_{Λ_bBN^*}(Q^2=-m_B^2)=9.11^{+1.54}_{-1.61}$, $f_{Λ_bB^*N^*}(Q^2=-m_{B^*}^2)=8.55^{+2.69}_{-2.21}$ and $g_{Λ_bB^*N^*}(Q^2=-m_{B^*}^2)=-0.25^{+0.16}_{-0.01}$.

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arXiv2025

Revisiting the $Λ_c^+\to Ληπ^+$ and the roles of intermediate resonances

In this paper, we first review the theoretical and experimental studies of the process $Λ_c^+ \to π^+ ηΛ$. Motivated by the recent BESIII and Belle measurements, we have conducted a theoretical study of the process $Λ_c^+ \to π^+ ηΛ$, where the $a_0(980)$ and $Λ(1670)$ resonances are dynamically generated from the $S$-wave meson meson and meson baryon interaction, respectively. Our results give a reasonable description of the invariant mass distributions, which implies that the spin flip contribution in the $Σ(1385)$ excitation plays an important role.

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arXiv2025

Determining the width of $D_{s0}^{*}(2317)$ by using $T_{c\bar{s}0}^{a}(2327)$ in a molecular frame

Motivated by the recent observation of the open-charm tetraquark $T_{c\bar{s}0}^{a}(2327)$ by the LHCb Collaboration, as well as results from Lattice QCD calculations, we consider the $T_{c\bar{s}0}^{a}(2327)$ and the $D_{s0}^{*}(2317)$ as $DK$ molecular states, with $I(J^{P})$ equal to $1(0^{+})$ and $0(0^{+})$, respectively, and we investigate their strong decay behavior in an effective Lagrangian approach. Within the model parameter range, we can reproduce the $T_{c\bar{s}0}^{a}(2327)$ experimental decay width, with the assumption that the $D_{s}^{+}π^{0}$ is the dominant decay channel of the $T_{c\bar{s}0}^{a+}(2327)$. In the same parameter range, we can establish a stringent limitation for the decay width of the $D_{s0}^{*}(2317)$, which is $(63.0-209)~\mathrm{keV}$ being significantly smaller than the PDG upper limit value.

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arXiv2025

$Λ_c(2910)$ and $Λ_c(2940)$ productions in association with $D_{s0}^{\ast }(2317)^-$ and $D_{s1}(2460)^-$ via $K^- p$ scattering

In the present work, we investigate the productions of $Λ_c(2910)$ and $Λ_c(2940)$ in association with $D_{s0}^{\ast }(2317)^-$ and $D_{s1}(2460)^-$ via $K^- p$ scattering, where we assign $Λ_c(2910)$ and $Λ_c(2940)$ as $D^\ast N$ molecular states with $J^P$ quantum numbers to be $1/2^-$ and $3/2^-$, respectively, while treating $D_{s0}^{\ast }(2317)$ and $D_{s1}(2460)$ as $S-$wave $DK$ and $D^\ast K$ molecular states, respectively. Utilizing an effective Lagrangian approach, we evaluated the cross sections for $K^-p \to D^{\ast}_{s0}(2317)^- Λ_{c}(2910) / Λ_{c}(2940)$ and $K^-p \to D_{s1}(2460)^{-} Λ_{c}(2910) / Λ_{c}(2940)$. Our estimations at $p_K=20$ GeV yield the following cross sections: \begin{eqnarray} σ(K^-p \to D^{\ast}_{s0}(2317)^- Λ_{c}(2910)) &=&\left(1.681^{+4.643}_{-1.296}\right)\ \mathrm{nb}, \nonumber σ(K^-p \to D^{\ast}_{s0}(2317)^- Λ_{c}(2940)) &=& \left(49.07^{+136.30}_{-37.86}\right)\ \mathrm{nb}, \nonumber σ(K^-p \to D_{s1}(2460)^{-} Λ_{c}(2910)) &=&\left(84.46^{+238.6}_{-65.35}\right)\ \mathrm{nb}, \nonumber σ(K^-p \to D_{s1}(2460)^{-} Λ_{c}(2940)) &=&\left(13.71^{+38.85}_{-10.61}\right)\ \mathrm{nb}, \nonumber \end{eqnarray} where the central values are estimated with $Λ_r=1.1$ GeV, while the uncertainties come from the variation of $Λ_r$ from 1.0 to 1.2 GeV. However, the ratios of the cross sections for the considered processes are evaluate to be very weakly dependent on the model parameters. In addition, the differential cross sections for the relevant processes are evaluated, and our estimations indicate that these differential cross sections reach the maximum at the forward angle limit.

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arXiv2025

$Z_{cs}^+$ production in the $B^+$ decays process

In the present work, we studied the $Z_{cs}^+$ exotic state production in the $B^+$ meson decays through the meson loop mechanism, where the $B^+$ meson decays into an anti-charmed meson and a charmed-strange meson pair, and consequently couples to $Z_{cs}$ and a light meson ($ϕ,ρ^0,ω,η,η^\prime$, and $π^0$) via exchanging a proper charmed or charmed-strange meson. Using the effective Lagrangian approach, we estimated the branching fractions of different channels find them to be on the order of $10^{-4}$ and their ratios are almost independent of the model parameter. The fit fractions of $Z_{cs}^+$ in different $B^+$ decay processes are also estimated, and we propose searching for $Z_{cs}^+$ in the $B^+ \to J/ψK^+η^\prime$ process, which should be accessible to both Belle II and LHCb Collaborations.

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arXiv2025

$Λ_{c}(2910)$ and $Λ_{c}(2940)$ productions in $π^{-} p$ scattering process

In the present work, we propose to investigate the productions of $Λ_{c}(2910)$ and $Λ_{c}(2940)$ in the $π^{-} p \rightarrow D^{-} D^{0} p$ processes by utilizing an effective Lagrangian approach, where $Λ_c(2910)$ and $Λ_c(2940)$ are considered as $D^\ast N$ molecular states with $J^P$ quantum numbers to be $1/2^-$ and $3/2^-$, respectively. With the cutoff parameter determined by the upper limit of the cross sections for $π^- p \to D^{\ast-} Λ_c(2286)$, the ratios of the cross sections for $π^- p \to D^{\ast-} Λ_c(2286)$, $π^- p \to D^{-} Λ_c(2286)$, $π^- p \to D^{-} Λ_c(2910)$, and $π^- p \to D^{-} Λ_c(2940)$ are estimated to be $1:4.8:1.42:0.26$ at $p_π=30$ GeV. Considering that the $Λ_{c}(2910)$ and $Λ_{c}(2940)$ state can further decay into $D^{0}p$, we estimate the cross sections for $π^{-} p \rightarrow D^{-} D^{0} p$ process and the differential cross sections depending on the $D^0 p$ invariant mass spectrum. Our estimations indicate that the total cross sections are $(0.49^{+1.56}_{-0.38})$ nb when $p_π=15~\mathrm{GeV}$, where the uncertainties result from the variation of the $Λ_{r}$. By comparing the contributions of the $s$, $u$, and $t$-channels, we conclude that the $t$-channel plays the predominant role. Moreover, the present estimations suggest that the structure around 2.9 GeV in the $D^0 p$ invariant mass spectrum of the $π^{-} p \rightarrow D^{-} D^{0} p$ process should correspond to $Λ_c(2910)$ rather than $Λ_c(2940)$, which can be tested by further experimental measurements at J-PARC in the future.

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arXiv2025

The light meson decays of $D$ wave charmonia

Motivated by the large non-$D\bar{D}$ branching fraction of $ψ(3770)$, we investigate the light meson decays of the $D$-wave charmonia in the present work with the meson loop mechanism. With the parameter range determined by $ψ(3770) \to ϕη$, our estimations of the branching fractions of the light meson decays of $ψ(3770)$ are consistent with the estimations in the literature. As for $ψ(3823)$, the partial widths of $K^\ast \bar{K}^\ast$ channel is estimated to be around 200 keV, which is the the predominant light meson decay channel of $ψ(3823)$. Our estimations also indicate that $K^{(\ast)}\bar{K}^{(\ast)}$ and $ρπ$ are the dominant light meson decay modes of $ψ(3842)$, while $η_{c2}$ dominantly decays into $ρρ$, $K^\ast \bar{K}^\ast$, $ωω$ and $ϕϕ$.

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arXiv2025

A combined analysis of $Y(2240)$ in the $e^+ e^- \to K^+ K^-$ and $e^+ e^- \to K_S^0 K_L^0$ processes

In the present work, we perform a combined analysis of the cross sections for $e^+ e^- \to K^+ K^-$ and $e^+ e^- \to K_S^0 K_L^0$ by including the interference between direct coupling process and resonance intermediate process. When setting the isospin factor as a free parameter, we can well reproduce the structures in the cross sections for $e^+ e^- \to K^+ K^-$ and $e^+ e^- \to K_S^0 K_L^0$, however, the isospin factor deviates with the isospin symmetry conservation predicted value of one. By fixing the isospin factor to be one, we find the cross sections for $e^+ e^-\to K^+ K^-$ can be accurately fitted, while the same model parameters fail to adequately reproduce the observed cross section for the process $e^+ e^- \to K_S^0 K_L^0$, which indicate that there should be contributions from other vector meson states, such as $ρ(2150)$ and $ω(2220)$. More precise experimental measurement below 2.0 GeV and between $2.3\sim 2.5$ GeV may provide more information about the vector resonances in this energy range, which should be accessible for the BESIII collaboration.

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arXiv2025

Theoretical study of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ in the process $Λ_b\to K^0D^0Λ$

Recently, the LHCb Collaboration has measured the processes $B^0\to\bar{D}^0D_s^+π^-$ and $B^+\to\bar{D}^0D_s^+π^+$, where the $D_s^+π^-$ and $D_s^+π^+$ invariant mass distributions show the significant signals of two new open-flavor tetraquark states $T_{c\bar{s}}(2900)^0$ and $T_{c\bar{s}}(2900)^{++}$, as the two of the isospin triplet. In this work, we have investigated the process $Λ_b\to K^0D^0Λ$ by taking into account the intermediate nucleon resonance $N^*(1535)$ and the tetraquark state $T_{c\bar{s}}(2900)^0$, which could be dynamically generated by the interactions of the $D^*K^*/D^*_sρ$ and the pseoduscalar mesons-octet baryons, respectively. Our results show that a clear peak of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ may appear in the $K^0D^0$ invariant mass distribution of the process $Λ_b\to K^0D^0Λ$, which could be tested by future experiments.

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arXiv2025

Theoretical study of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ in the process $\bar{B}_s^0 \to K^0 D^0 π^0$

Recently, the LHCb Collaboration has measured two decay processes $B^0\to\bar{D}^0D_s^+π^-$ and $B^+\to D^-D_s^+π^+$ related to isospin symmetry, where two new open-flavor tetraquark states $T_{c\bar{s}}(2900)^0$ and $T_{c\bar{s}}(2900)^{++}$ that belong to an isospin triplet were observed in the $D_s^+π^-$ and $D_s^+π^+$ invariant mass distributions. In this work, we have investigated the validity of the process $\bar{B}_s^0\to K^0D^0π^0$ as the promising process to confirm the existence of $T_{c\bar{s}}(2900)^0$ resonance. Taking into account the tetraquark state $T_{c\bar{s}}(2900)$, as well as intermediate resonances $K^*(892)$, $K_0^*(1430)$, and $K_2^*(1430)$, it has been shown that a clear peak of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ appears in the $K^0D^0$ invariant mass distribution of the process $\bar{B}_s^0\to K^0D^0π^0$, which could be tested by future experiments.

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arXiv2025

Two-body Hidden Charm Decays of $D$ Wave Charmonia

The experimental observations of $ψ_2(3823)$ and $ψ_3(3842)$ make $D$ wave charmonia family abundant. In the present work, we investigate the hidden charm decay processes of spin triplets of the $D$-wave charmonia with the meson loop mechanism. The model parameter $α_Λ$ is determined by reproducing the branching fraction of $ψ(3770)\to J/ψη$. With this range of model parameter values, the branching fractions (partial widths) of $ψ(3770) \to η_c ω$, $ψ_2(3823)/ψ_3(3842) \to J/ψη$, $ψ_2(3823)/ψ_3(3842) \to η_c ω$ are estimated. Our estimations find that the partial width of $ψ_2(3823) \to J/ψη$ is $\left(29.64^{+4.01}_{-4.63}\right)\ \mathrm{keV}$, and the partial width ratio of $ψ_2(3823) \to J/ψη$ relative to $ψ_2(3823)\to γχ_{c1}$ is about $10\%$, which could be tested by further precise measurements from the BESIII, Belle II and LHCb Collaborations.

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arXiv2024

The $Λ_c^+\toηπ^+Λ$ reaction and the $Λa_0^+(980)$ and $π^+Λ(1670)$ contributions

We study from the theoretical point of view the $Λ_c^+\to π^+ ηΛ$ reaction, recently measured by the Belle and BESIII Collaborations, where clear signals are observed for $a_0(980)$, $Λ(1670)$, and $Σ(1385)$ excitation. By considering the $a_0(980)$ and $Λ(1670)$ as dynamically generated resonances from the meson meson and meson baryon interaction, respectively, we are able to determine their relative production strength in the reaction, which is also tied to the strength of the $π^+ ηΛ$ tree level contribution. We observe that this latter strength is very big and there are large destructive interferences between the tree level and the rescattering terms where the $a_0(980)$ and $Λ(1670)$ are generated. The $Σ(1385)$ contribution is included by means of a free parameter, the only one of the theory, up to a global normalization, when one considers only external emission, and we observe that the spin flip part of this term, usually ignored in theoretical and experimental works, plays an important role determining the shape of the mass distributions. Internal emission is also considered and it is found to play a minor role.

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arXiv2024

Predicting hidden bottom molecular tetraquarks with a complex scaling method

In present work, we perform a coupled-channel analysis of $B^{(*)}_{(s)}\bar{B}^{(*)}_{(s)}$ systems with the one-boson-exchange potentials. We first study the $I(J^{PC})=1(1^{+-})$ $B\bar{B}^{*}/B^{*}\bar{B}^{*}$ system to describe the $Z_{b}(10610)$ and $Z_{b}(10650)$ particles as molecular states and determine the reasonable range of cutoff parameter $Λ$. Then, other $B^{(*)}_{(s)}\bar{B}^{(*)}_{(s)}$ combinations with different quantum numbers are systematically investigated. Some bound states and resonances appear in the isoscalar systems, while only several shallow bound states exist for isovector systems. Far away from the excited conventional $P-$wave bottomium, these predicted states can be easily identified as exotic particles both theoretically and experimentally. Moreover, the $η_b(nS)/Υ(nS)$ plus light mesons are the excellent final states to search for the bound states, while the $B\bar B^*+h.c.$ and $B^* \bar B^*$ channels are suitable for the resonances. We highly recommend that the LHCb and Belle II Collaborations can hunt for these bottomonium-like states in future.

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arXiv2024

Productions of bottom and bottom-strange mesons in pion and kaon induced reactions

In the present work, we propose to explore the productions of the bottom and bottom-strange mesons in the high-energy pion and kaon-induced reactions on a proton target. The cross sections are evaluated with an effective Lagrangian constructed by the heavy-quark limit and chiral symmetry. Our estimations show that at $P_π=80$ GeV, the cross sections for $B(5279)$, $B^\ast (5325)$, $B_0^\ast (5738)$, $B_1^\prime (5757)$, $B_1(5721)$ and $B_2^\ast (5747)$ production processes are estimated to be $3.19 \sim 86.26$, $1.86\sim 51.29$, $0.87 \sim 24.25$, $0.84 \sim 23.14$, $162.35 \sim 4477.66$, and $57.16 \sim 1604.43$ nb, respectively, where uncertainties arise from the model parameter. In addition, the cross sections for the corresponding bottom-strange mesons production processes are very similar. Moreover, our estimations indicate that the ratios of these cross sections are almost independent on the model parameters. In particular, the cross-section ratios related to the states in the same doublets are of order one, which is consistent with the expectation of heavy-quark limit. The cross sections related to the states in the $T$ doublets are about two orders larger than those related to the states in the $S$ doublets.

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