EWEn Wang

En Wang

Zhengzhou University
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En Wang has a total of 740 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

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    Identifying $\Sigma (1380)$ and $\Sigma (1430)$ in the $J/\psi \rightarrow \Lambda \pi \bar{\Sigma }$ reaction

    by Wen-Tao Lyu, Eulogio Oset, De-Min Li, En Wang

    We study the $$J/\psi \rightarrow \Lambda \pi \bar{\Sigma }$$ J / ψ → Λ π Σ ¯ reaction by looking at the $$\pi ^+ \Lambda $$ π + Λ mass distribution at low energies, in search of signals for the low lying $$\Sigma ^*$$ Σ ∗ excited states. Apart from a clear signal of the $$\Sigma (1385) (3/2^+)$$ Σ ( 1385 ) ( 3 / 2 + ) state, we find a smaller peak for the predicted $$\Sigma (1430) (1/2^-)$$ Σ ( 1430 ) ( 1 / 2 - ) , which has already been confirmed by the Belle Collaboration. A first analysis, considering only the $$\pi \Lambda $$ π Λ interaction, shows that the low energy part of the spectrum is better reproduced including contributions from the $$\Sigma (1430)$$ Σ ( 1430 ) and the predicted $$\Sigma (1380)(1/2^-)$$ Σ ( 1380 ) ( 1 / 2 - ) state that has been claimed before from analyses of different experiments. However, when we consider the $$\pi \bar{\Sigma }$$ π Σ ¯ interaction the need for the $$\Sigma (1380)$$ Σ ( 1380 ) disappears.

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    Probing the isospin structure and low-lying resonances in Λ c + → n K ¯ 0 π + decays

    by Meng-Yuan Li, Guan-Ying Wang, Neng-Chang Wei, De-Min Li, En Wang

    The Cabibbo-favored decay Λ c + → n K ¯ 0 π + offers a unique window to explore unresolved puzzles in the low-energy baryon spectroscopy and the isospin dynamics of the K ¯ N system. Recent experimental results present a, for now, contradiction: LHCb and Belle analyses of Λ c + → p K − π + suggest the p K − ( I = 0 ) component dominates, while the Beijing Spectrometer III (BESIII) hints at significant contributions from both isospin 0 and 1 in the n K ¯ 0 system of Λ c + → n K S 0 π + . Furthermore, the measured branching fraction of Λ c + → n K S 0 π + exceeds SU(3) symmetry predictions by a factor of 3–4, signaling strong contributions from low-lying resonances. In this work, we provide a theoretical analysis of Λ c + → n K ¯ 0 π + within the coupled-channel chiral unitary approach, where the N ( 1535 ) and Λ ( 1670 ) can be dynamically generated. Our calculations show a narrow peak from N ( 1535 ) in the π + n invariant mass spectrum and a distinct dip from Λ ( 1670 ) in the K ¯ 0 n spectrum. The dip structure is qualitatively consistent with the Λ ( 1670 ) manifestation in K ¯ N → K ¯ N scattering, supporting its molecular interpretation. This study not only connects the experimental observations but also highlights Λ c + → n K ¯ 0 π + as a crucial process to disentangle the nature of N ( 1535 ) and Λ ( 1670 ) . Future precise measurements of this decay channel by the BESIII, Belle II, LHCb, and the proposed Super Tau-Charm Facility are strongly encouraged.

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    Dynamically generated N ( 1535 ) state in the Λ c + → p K ¯ 0 π 0 decay

    by Ying Li, En Wang, Li-Sheng Geng, Ju-Jun Xie

    We present a theoretical analysis of the process Λ c + → p K ¯ 0 π 0 within the chiral unitary approach, with particular emphasis on the dynamically generated N ( 1535 ) resonance. In addition to N ( 1535 ) , our model incorporates contributions from other intermediate resonances including N ( 1650 ) , K * ( 892 ) , K 0 * ( 1430 ) , N ( 1440 ) , and Σ ( 1750 ) . The calculated invariant mass distributions and Dalitz plot are in good agreement with the recent Belle measurements. Our analysis highlights the crucial role of N ( 1535 ) state in this decay channel and supports its interpretation as a dynamically generated state arising from coupled-channel meson-baryon interactions.

    Cited by 4
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    Role of $\Sigma(1660)$ in the $K^- p \to\pi^0\pi^0\Sigma^0$ reaction

    by Xing-Yi Ji, Si-Wei Liu, Wen-Tao Lyu, De Min Li, En Wang, Ju-Jun Xie

    The processes of $K^-p \to \pi^0 \pi^0 \Sigma^0$ and $K^- p \to \pi^0 \Lambda(1405)$ are studied within the effective Lagrangian approach. In addition to the ``background" contribution from the $u$-channel nucleon pole term, contribution from the $\Sigma(1660)$ resonance with spin-parity $J^P=1/2^+$ is also considered. For the $K^-p \to \pi^0 \pi^0 \Sigma^0$ reaction, we perform a calculation for the total and differential cross sections by considering the contribution from the $\Sigma(1660)$ intermediate resonance decaying into $\pi^0 \Lambda(1405)$ with $\Lambda(1405)$ decaying into $\pi^0 \Sigma^0$. With our model parameters, the available experimental data on both the $K^-p \to \pi^0 \pi^0 \Sigma^0$ and $K^- p \to \pi^0 \Lambda(1405)$ reactions can be fairly well reproduced. It is shown that we really need the contribution from the $\Sigma(1660)$ resonance, and that these experimental measurements could be used to determine some properties of the $\Sigma(1660)$ resonance. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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    Probing the isospin structure and low-lying resonances in $Λ_c^+ \to n\bar{K}^0 π^+$ decays

    by Meng-Yuan Li, Guan-Ying Wang, Neng-Chang Wei, De-Min Li, En Wang

    The Cabibbo-favored decay $Λ_c^+ \to n \bar{K}^0π^+$ offers a unique window to explore unresolved puzzles in the low-energy baryon spectroscopy and the isospin dynamics of the $\bar{K}N$ system. Recent experimental results present a, for now, contradiction: LHCb and Belle analyses of $Λ_c^+ \to p K^-π^+$ suggest the $pK^-$ ($I=0$) component dominates, while the BESIII hints at significant contributions from both isospin $0$ and $1$ in the $n\bar{K}^0$ system of $Λ_c^+ \to n K_S^0 π^+$. Furthermore, the measured branching fraction of $Λ_c^+ \to n K_S^0 π^+$ exceeds SU(3) symmetry predictions by a factor of 3-4, signaling strong contributions from low-lying resonances. In this work, we provide a theoretical analysis of $Λ_c^+ \to n \bar{K}^0π^+$ within the coupled-channel chiral unitary approach, where the $N(1535)$ and $Λ(1670)$ can be dynamically generated. Our calculations show a narrow peak from $N(1535)$ in the $π^+ n$ invariant mass spectrum and a distinct dip from $Λ(1670)$ in the $\bar{K}^0 n$ spectrum. The dip structure is qualitatively consistent with the $Λ(1670)$ manifestation in $\bar{K}N \to \bar{K}N$ scattering, supporting its molecular interpretation. This study not only connects the experimental observations but also highlights $Λ_c^+ \to n \bar{K}^0π^+$ as a crucial process to disentangle the nature of $N(1535)$ and $Λ(1670)$. Future precise measurements of this decay channel by the BESIII, Belle II, LHCb, and the proposed Super Tau-Charm Factory are strongly encouraged.

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    Role of $Σ(1660)$ in the $K^- p \toπ^0π^0Σ^0$ reaction

    by Xing-Yi Ji, Si-Wei Liu, Wen-Tao Lyu, De-Min Li, En Wang, Ju-Jun Xie

    The processes of $K^-p \to π^0 π^0 Σ^0$ and $K^- p \to π^0 Λ(1405)$ are studied within the effective Lagrangian approach. In addition to the ``background" contribution from the $u$-channel nucleon pole term, contribution from the $Σ(1660)$ resonance with spin-parity $J^P=1/2^+$ is also considered. For the $K^-p \to π^0 π^0 Σ^0$ reaction, we perform a calculation for the total and differential cross sections by considering the contribution from the $Σ(1660)$ intermediate resonance decaying into $π^0 Λ(1405)$ with $Λ(1405)$ decaying into $π^0 Σ^0$. With our model parameters, the available experimental data on both the $K^-p \to π^0 π^0 Σ^0$ and $K^- p \to π^0 Λ(1405)$ reactions can be fairly well reproduced. It is shown that we really need the contribution from the $Σ(1660)$ resonance, and that these experimental measurements could be used to determine some properties of the $Σ(1660)$ resonance.

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    Finding a clean process $B^- \to K^- D^0 K^0$ to probe absolutely exotic four-quark states

    by Man-Yu Duan, Guan-Ying Wang, Yun Liang, En Wang, Xiang Liu, Dian-Yong Chen

    Motivated by the observations of $T_{c\bar{s}0}(2900)^0$ and $T_{c\bar{s}0}(2900)^{++}$, we propose to search for $T_{c\bar{s}0}(2900)^0$ in the cleaner process $B^- \to K^- D^0 K^0$. In the $D^*K^*$ molecular picture, our estimates suggest that $T_{c\bar{s}0}(2900)^0$ should contribute significantly to the $D^0 K^0$ invariant mass distribution in $B^- \to K^- D^0 K^0$, as reported by the Belle II Collaboration. The corresponding fit fraction is estimated to be $(9.72\pm 3.92)\%$. Further precise measurements of this process at Belle II and LHCb could help clarify the nature of $T_{c\bar{s}0}(2900)$.

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    Theoretical study of hadronic molecular states with quark composition $bc \bar s \bar q$

    by Wenying Liu, Hua-Xing Chen, En Wang

    In this work, we explore the possible existence of hadronic molecular states with the quark content $bc\bar{s}\bar{q}$ by examining the interactions among the following meson pairs: $\bar{B}_s D$, $\bar{B} D_s$, $\bar{B}_s^* D$, $\bar{B}^* D_s$, $\bar{B}_s D^*$, $\bar{B} D_s^*$, $\bar{B}_s^* D^*$, and $\bar{B}^* D_s^*$. Within the framework of the extended local hidden gauge formalism, we solve the coupled-channel Bethe-Salpeter equation to search for poles in the complex energy plane. Our analysis reveals six dynamically generated poles that may correspond to bound or resonant hadronic molecular states. Specifically, we find: one $J^P = 0^+$ state below the $\bar{B}_s D$–$\bar{B} D_s$ threshold; one $J^P = 1^+$ state below the $\bar{B}_s^* D$–$\bar{B}^* D_s$ threshold; another $J^P = 1^+$ state below the $\bar{B}_s D^*$–$\bar{B} D_s^*$ threshold; and a triplet of states with quantum numbers $J^P = 0^+, 1^+, 2^+$ located below the $\bar{B}_s^* D^*$–$\bar{B}^* D_s^*$ threshold. With a regularization cutoff of $q_\mathrm{max} = 600~\mathrm{MeV}$, the binding energies of these states are estimated to lie in the range of 10–20 MeV, suggesting the presence of loosely bound molecular configurations.

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    Correlation functions and inverse problem for the $N^*(1535)$ and $\Sigma^*(1430)$

    by Chu-Wen Xiao, Hai-Peng Li, Wei-Hong Liang, Raquel Molina, Jia-Jun Wu, En Wang, Eulogio Oset

    In the present work, we dynamically generate the $N^*(1535)$ and $\Sigma^*(1430)$ states using a coupled-channel approach and compute their correlation functions. We then solve the inverse problem by extracting scattering observables from these correlation functions, including bound-state properties and molecular composition. By treating our theoretical correlation functions as experimental data, we perform a fit within a general framework to reconstruct the underlying interaction parameters. Employing the bootstrap method to quantify uncertainties, we demonstrate that with errors comparable to assumed experimental precision, the scattering lengths and effective ranges of all channels can be determined with high accuracy.

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    Revisiting the $\Lambda_c^+ \to \Lambda \eta \pi^+$ and the roles of the intermediate resonances

    by En Wang, Wen-Tao Lyu, Man-Yu Duan, Chu-Wen Xiao, Dian-Yong Chen, Ju-Jun Xie, Eulogio Oset

    In this paper, we first review the theoretical and experimental studies of the process $\Lambda_c^+ \to \pi^+ \eta \Lambda$. Motivated by the recent BESIII and Belle measurements, we have conducted a theoretical study of the process $\Lambda_c^+ \to \pi^+ \eta \Lambda$, where the $a_0(980)$ and $\Lambda(1670)$ 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 $\Sigma(1385)$ excitation plays an important role.

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