arXiv subjects

Ming-Xiao Duan

Publications and source records attributed to Ming-Xiao Duan.

8 recordsLinked to original sources

arXiv2026

Nature of $K^*(1680)$ and $q\bar{q}$-hybrid mixing as the SU(3) partner of $η_{1}(1855)$ in the strange sector

We presents an investigation of the $K^*(1680)$ state in its strong decays into two-body finial states within the flux-tube model and quark pair creation model. Since the charge conjugation parity is not conserved in the strange sector, the conventional $q\bar{q}$ states of $J^{P(C)}=1^{-(-)}$ can mix with the lowest hybrid states with $J^{P(C)}=1^{-(+)}$. Our analysis of the $K^*(1680)$ two-body strong decays indicates that the decay pattern of $K^*(1680)$ cannot be explained by the conventional $q\bar{q}$ scenario. Meanwhile, strong evidence shows the $q\bar{q}$-hybrid mixing mechanism in the strange sector. The phenomenological consequences of such a mixing are also discussed. Our study can provide a guidance for the future search for hybrid multiplets in experiment at BESIII, LHCb, and Belle-II.

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arXiv2025

A unified approach for the hadronic weak decays of $Λ$ and $Σ^{\pm}\to Nπ$

We provide a unified approach for the two-body hadronic weak decays of hyperons with $S=-1$, i.e. $Λ$ and $Σ^\pm$, in the framework of the non-relativistic constitute quark model (NRCQM). A combined analysis shows that the branching ratios and asymmetry parameters of the decay channels $Λ\to pπ^-$ and $Σ^\pm\to Nπ$ can be well described in the same framework with the direct pion emission, color suppressed internal $W$ emission, and pole terms included. However, the channel $Λ\to nπ^0$ indicates significant deviations from the experimental data based on these mentioned transition mechanism. We demonstrate that the final state interactions (FSIs) via the coupled-channel rescatterings play a crucial role in $Λ\to nπ^0$. Namely, the dominant decay channel of $Λ\to pπ^-$ can contribute to $Λ\to nπ^0$ via the $pπ^-\to nπ^0$ rescatterings. This is a leading correction effect for $Λ\to nπ^0$ at the one-loop level. We find that such FSIs only become the leading effects in $Λ\to nπ^0$, but contribute as subleading contributions in other channels. We also demonstrate that the pole terms are indispensable in these hyperon decays. In particular, for $Σ^-\to nπ^-$ and $Σ^+\to nπ^+$, it shows that $Λ(1405)$ as the intermediate state in the pole term amplitude is necessary for reproducing the experimental data. We also find that a dynamic selection rule forbids the radial excitation state $N(1710)$ of the quark model multiplet $|70, ^28,2,0^+,1/2^+\rangle$ from contribution. To some extent, the hyperon hadronic weak decays serve as a special probe for the underlying transition mechanisms and can provide some constraints on the intermediate $J^P=1/2^\pm$ baryon resonances.

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arXiv2024

$J/ψ$ photoproduction near threshold and signals for the hidden charm pentaquarks

We study the $J/ψ$ photoproduction $γp\to J/ψp$ near threshold to investigate the role played by the open charm channels and possible signals from the hidden charm $P_c$ pentaquark states. With the diffractive mechanism described by a Pomeron exchange model extrapolated from high energies to the lower energy region, it shows that the differential cross sections compared with the recent results from the GlueX Collaboration have apparent deficits in the large scattering angles. The inclusion of the open charm channels and intermediate $P_c$ states can significantly improve the descriptions of the differential cross section data, in particular, at the energy regions of the $Λ_c\bar{D}^{(*)}$ thresholds. This can explain the structures observed by the GlueX Collaboration at the $Λ_c\bar{D}^{(*)}$ thresholds as the open charm CUSP effects. Given that these $P_c$ pentaquark states are hadronic molecules dynamically generated by the $Σ_c\bar{D}^{(*)}$, we find that the production of these $P_c$ states should be suppressed at leading order since their couplings to both $γp$ and $J/ψp$ are through loop transitions. This can explain why no obvious signals for the $P_c$ states are observed by the present datasets. In order to further disentangling the role played by $s$-channel mechanisms, we also investigate the polarized beam asymmetry which shows sensitivities to the open charm threshold effects and interferences from the $P_c$ productions. Experimental measurement of this observable at the Jefferson Laboratory is strongly encouraged.

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arXiv2024

The role of the short-distance interaction in $e^+e^-\to γX(3872)$

In this study, we analyze the cross-section data from the $e^+e^-\to γJ/ψω$ process to explore both short-distance and long-distance interactions for the radiative transition $Y(4200)\to γX(3872)$. We investigate the short-distance effects through the E1 transition among the $c\bar{c}$ components, and the long-distance effects via hadronic loop diagrams. Our numerical analysis reveals that short-distance interactions play a significantly larger role in the radiative transition than that of the long-distance interactions. This finding underscores the importance of the compact $c\bar{c}$ components in both the initial and final states for accurately understanding the cross-section $σ[e^+e^-\to γJ/ψω]$. Furthermore, with the help of relative branch ratio $\mathcal{R}$ we estimate the $Γ[Y(4200)\toγX(3872)]$ implied in the the experimental study. Finally, we also discuss the possible existence of $ψ(4040)$ signal within the cross-section data.

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arXiv2023

Predictions for feed-down enhancements at the $Λ_c \bar{D}$ and $Λ_c \bar{D}^*$ thresholds via the triangle and box singularities

We demonstrate that triangle singularity (TS) and box singularity (BS) mechanisms can produce unique narrow enhancements at the $Λ_c\bar{D}$ and $Λ_c\bar{D}^*$ thresholds in the invariant mass spectra of $J/ψp$ and $J/ψpπ$, respectively. Taking into account that such mechanisms only depend on the initial $Σ_c^{(*)}\bar{D}^{(*)}$ interactions near threshold within the TS or BS kinematic regimes, the $Λ_c\bar{D}$ and $Λ_c\bar{D}^*$ threshold enhancements can be regarded as a feed-down phenomenon originated from both the heavier pentaquark decays and the $Σ_c^{(*)}\bar{D}^{(*)}$ scatterings from the continuum. A search for these structures in the $J/ψp$ and $J/ψpπ$ spectra in both exclusive and semi-inclusive processes will provide a smoking-gun evidence for the hadronic molecule nature of those observed pentaquarks and clarify the role played by the TS and BS in the near-threshold dynamics.

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arXiv2021

Where are $3P$ and higher $P-$wave states in the charmonium family?

How to hunt for higher $P$-wave states of charmonium is still an open topic when $2P$ charmonia were identified. {In this work, we present an unquenched quark model calculation to illustrate the spectroscopy behavior of these $3P$, $4P$ and $5P$ states in charmonium family.} For the $3P$ charmonia, the predicted masses are around 4.2 GeV and their two-body open-charm decay behaviors were given, by which we propose that searching for these $3P$ states via their open-charm decay channels from $γγ$ fusion and $B$ decay can be accessible at future experiment like LHCb and Belle II. We continue to calculate the masses of these $4P$ and $5P$ charmonia. Combing with these calculated results of higher $P$-wave states of charmonium, we find that the coupled-channel effect becomes more obvious with increasing the radial quantum number, which can be understood well by the modified Godfrey-Isgur model with screened potential.

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arXiv2021

Role of the newly measured $B\to KD\bar{D}$ process to establish $χ_{c0}(2P)$ state

In this work, the branching ratio $\mathcal{B}[B\to Kχ_{c0}(2P)]$ is extracted for the first time through the fit fractions in the newly measured $B\to KD\bar{D}$ process by LHCb. With the rescattering mechanism, this extracted branching ratio is reproduced well. Our study further enforces the role of the newly measured $B\to KD\bar{D}$ process to establish the $χ_{c0}(2P)$ charmonium state, which is a crucial step when constructing charmonium family.

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arXiv2020

Possibility of charmoniumlike state $X(3915)$ as $χ_{c0}(2P)$ state

In this work, we seriously discuss whether $X(3915)$ can be treated as a $χ_{c0}(2P)$ state. Based on an unquenched quark model, we give the mass spectrum of the $χ_{cJ}(2P)$ states, where there are no free input parameters in our calculation. Our result shows that the mass gap between $χ_{c0}(2P)$ and $χ_{c2}(2P)$ can reach 13 MeV, which can reproduce the mass difference between $Z(3930)$ and $X(3915)$. Additionally, the calculated masses of $χ_{c0}(2P)$ and $χ_{c2}(2P)$ are consistent with experimental values of $X(3915)$ and $Z(3930)$, respectively. Besides, giving the mass spectrum analysis to support $X(3915)$ as $χ_{c0}(2P)$, we also calculate the width of $χ_{c0}(2P)$ with the same framework, which is also consistent with the experimental data of $X(3915)$. Thus, the possibility of charmoniumlike state $X(3915)$ as $χ_{c0}(2P)$ state is further enforced.

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