arXiv subjects

Quan-Yun Guo

Publications and source records attributed to Quan-Yun Guo.

10 recordsLinked to original sources

arXiv2026

$P_{c}(4312)$, $P_{c}(4440)$, and $P_{c}(4457)$ productions in $e^{+} e^{-}$ collisions

In the present work, we propose to investigate the productions of $P_{c}(4312)$, $P_{c}(4440)$, and $P_{c}(4457)$ in the $e^{+} e^{-} \rightarrow p \bar{p} J/ψ$ process by utilizing an effective Lagrangian approach, where $P_{c}(4312)$ is considered as $Σ_{c} \bar{D}$ molecular state with $J^{P}=1/2^{-}$, while $P_{c}(4440)$ and $P_{c}(4457)$ are considered as $Σ_{c} \bar{D}^{\ast}$ molecular states with $J^{P}=1/2^{-}$ and $J^{P}=3/2^{-}$, respectively. For the $e^{+} e^{-} \rightarrow \bar{p} P_{c}(4312)$, $e^{+} e^{-} \rightarrow \bar{p} P_{c}(4440)$, and $e^{+} e^{-} \rightarrow \bar{p} P_{c}(4457)$ processes, the cross sections are evaluated to be ($27.8^{+42.2}_{-17.9}$) fb, ($38.7^{+58.6}_{-25.1}$) fb, and ($1.44^{+2.18}_{-0.93}$) fb at $\sqrt{s}=6$ GeV, respectively, where the central values are estimated with $Λ_{r}=2.5$ GeV, and the uncertainties are resulted from the variations of $Λ_{r}$ from 2.0 to 3.0 GeV. Considering that the $P_{c}$ states can decay into $J/ψp$, we estimate the cross sections for $e^{+} e^{-} \rightarrow p \bar{p} J/ψ$ and the differential cross sections depending on the $J/ψp$ invariant mass. At $\sqrt{s}=6$ GeV, the cross sections for $e^{+} e^{-} \rightarrow p \bar{p} J/ψ$ are estimated to be ($14.7^{+22.2}_{-9.50}$) fb. Moreover, our estimations indicate that the cross section resulted from the $P_{c}(4440)$ and $\bar{P}_{c}(4440)$ intermediate states is dominant. In the $J/ψp$ invariant mass spectrum, our estimations reveal that the peak structure between 4.42 and 4.46 GeV primarily originates from $P_{c}(4440)$.

hep-ph↗

arXiv2026

$Λ_{c}(2910)$ and $Λ_{c}(2940)$ productions in $p \bar{p}$ annihilation

In this work, we investigate the productions of $Λ_{c}(2910)$ and $Λ_{c}(2940)$ in the $p \bar{p} \rightarrow \barΛ_{c} D^{0} p$ process by utilizing an effective Lagrangian approach, where both $Λ_{c}(2910)$ and $Λ_{c}(2940)$ are considered as $D^{\ast}N$ molecular states with $J^{P}=1/2^{-}$ and $3/2^{-}$, respectively. In addition to the $t$-channel $D$ and $D^{\ast}$ exchanges, the contribution from light-meson exchange is also considered. At $\sqrt{s}=10$ $\mathrm{GeV}$, our estimations indicate that the total cross sections for $p \bar{p} \rightarrow \barΛ_{c} D^{0} p$ are $(130.7^{+397.1}_{-103.9})$ nb, where the central value is estimated with $Λ_{r}=1.1$ GeV, and the uncertainties are resulted from the variation of parameter $Λ_{r}$ from 1.0 GeV to 1.2 GeV. Our results indicate that the light meson exchange diagrams are very important, which provide a very large smooth background. Moreover, the estimations of the $D^{0}p$ invariant mass spectrum reveal that the peak structure between 2.9 and 3.0 GeV primarily originates from $Λ_c(2910)$, while the signal of $Λ_{c}(2940)$ is about one order smaller than that of $Λ_{c}(2910)$. Furthermore, the resulting Dalitz plot is estimated with $\sqrt{s}=8$ GeV. It is expected that our estimations in the present work can be tested by future experiments at $\mathrm{\bar{P}ANDA}$.

hep-ph↗

arXiv2026

$d_{N Ω}$ production in $Ωd$ scattering process

In the present work, we propose to investigate the production of $d_{N Ω}$ in the $Ω^{-} d \rightarrow p d_{N Ω}^-$ process by utilizing an effective Lagrangian approach, where $d_{N Ω}$ is identified as $NΩ$ bound state with the binding energy $E_{b}=2.46$ MeV. Experimentally, the J-PARC hadron facility proposed to investigate the $K^{-}p \rightarrow Ω^{-} \bar{K}^{(*)0} K^{+}$ process, which is expected to yield an $Ω$ beam with the momentum of approximately 3 GeV. Additionally, theoretical studies of the $ψ(2S) \rightarrow Ω^{-} \barΩ^{+}$ process at BESIII provided an $Ω$ beam with the momentum of 774 MeV. Considering these two potential $Ω$ beam sources, our estimations show that for the $Ω^{-} d \rightarrow p d_{N Ω}^-$ process, the cross sections are $\Big(329.7^{+26.9}_{-49.6}\Big)$ $μ$b, $\Big(174.0^{+26.5}_{-38.2}\Big)$ $μ$b, $\Big(16.9^{+7.4}_{-7.7}\Big)$ $μ$b, and $\Big(2.0^{+1.8}_{-1.4}\Big)$ $μ$b at $P_Ω =$ 0.7, 0.9, 2.0, and 4.0 GeV, respectively, where the central values are estimated with $Λ_{r}=1.0$ GeV, and the errors come from the variation of $Λ_{r}$ from 0.8 to 1.2 GeV. We also estimate the differential cross sections, which reach the maximum at the forward angle limit. In addition, since the $d_{N Ω}$ dibaryon predominantly decays into $ΞΛ$. Therefore, we further investigate the $Ω^{-} d \rightarrow p Ξ^- Λ$ process and estimate the relevant cross sections. It is expected that the present estimations can be tested by further experimental measurements at J-PARC and STCF in the future.

hep-ph↗

arXiv2026

Production of $Ξ(1530)$ in the $K^- p$ scattering process

In the present work, we examine the production of $Ξ(1530)$ in the $K^- p \to K^{+} Ξ(1530)^{-}$ and $K^- p \to K^{0} Ξ(1530)^{0}$ reactions utilizing an effective Lagrangian approach. To accurately fit the cross sections for both processes, we include nine $Λ$ and $Σ$ hyperons and their resonances in both $s$- and $u$-channel processes. Considering the discrepancy of the measured cross sections for $K^- p \to K^+ Ξ(1530)^-$ within the range $\sqrt{s}=[2.087, 2.168]\ \mathrm{GeV}$, we employ two distinct fitting strategies: a uniform weighting scheme (model A) and a different weighting approach (model B). A comparative analysis suggests that model A yields a superior global agreement with experimental data compared to model B. Beyond fitting the cross sections, we also estimate the individual contributions from various intermediate states. Our results reveal that the cross section arising from the $Σ(1193)$ intermediate process is dominant. Furthermore, we predict different cross sections for $K^- p\to K^+Ξ(1530)^-$ and $K^- p\to K^0Ξ(1530)^0$ at several representative center-of-mass energies, providing testable predictions for forthcoming J-PARC experiments.

hep-ph↗

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.

hep-ph↗

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.

hep-ph↗

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.

hep-ph↗

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.

hep-ph↗

arXiv2024

Strong decays of the $Λ_{c}(2910)$ and $Λ_{c}(2940)$ in the $ND^{*}$ molecular frame

Stimulated by the observation of a new structure, named $Λ_{c}(2910)$, in the $Σ_{c}(2455)^{0,++}π^{+,-}$ decay channel from B meson decay process by the Belle Collaboration, and the similarity of the $Λ_{c}(2910)/Λ_{c}(2940)$ and $P_{c}$ states, we investigate the decay behavior of the $Λ_{c}(2910)$ and $Λ_{c}(2940)$ in the $N D^{*}$ molecular frame with the possible $J^{P}$ quantum numbers to be $1/2^{-}$ and $3/2^{-}$. We employ an effective Lagrangian approach to evaluate the partial widths of $ND$, $Σ_{c}π$ and $Σ_{c}^{*}π$ channels. The estimations in the present work indicate that the $J^P$ quantum numbers of $Λ_{c}(2910)$ and $Λ_{c}(2940)$ are preferred to be $1/2^{-}$ and $3/2^{-}$, respectively. From the present estimations, we also find the branching ratio of $Λ_c(3/2) \to Σ_c^\ast π$ is much larger than that of $Λ_c(1/2) \to Σ_c^\ast π$, thus $Σ_{c}^{*}π$ could be a good channel to distinguish the $J^{P}$ quantum numbers of $Λ_{c}(2910)$ and $Λ_{c}(2940)$. Therefore, we suggest to searching for the structure in $Σ_{c}^{*}π$ invariant mass distribution in Belle $\amalg$.

hep-ph↗

arXiv2023

$Ξ(1620)$ production in $K^- p$ scattering process

In the present work, the production of $Ξ(1620)$ in the $K^- p$ scattering process is investigated by using an effective Lagrangian approach, where $Ξ(1620)$ is considered as a $\bar{K} Λ$ molecular state. Our estimations indicate that the cross sections for $K^-p\to K^+ Ξ(1620)^-$ are $(1.48 ^{+ 1.12}_{-0.69}) \ \mathrm{μb}$ at $P_K=2.8 \ \mathrm{GeV}$, where the uncertainties are resulted from the variation of the model parameter. As for the $K^-p\to K^+ π^0 Ξ^-$ process, the cross sections are estimated to be $(0.61 ^{+0.47}_{-0.29})\ \mathrm{μb}$ at $P_K =2.8 \ \mathrm{GeV}$, which is consistent with the experimental measurements.

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