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Author

Rui Chen

Bio: Rui Chen is an academic researcher from Peking University. The author has contributed to research in topics: Charm (quantum number). The author has an hindex of 6, co-authored 9 publications receiving 220 citations. Previous affiliations of Rui Chen include Hunan Normal University & Lanzhou University.

Papers
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Journal ArticleDOI
Rui Chen1, Rui Chen2, Zhi-Feng Sun2, Xiang Liu2, Shi-Lin Zhu1 
TL;DR: In this paper, the authors present a direct calculation by the one-boson exchange model and demonstrate explicitly that the loosely bound molecular hidden-charm pentaquark states composed of an $S$-wave charmed baryon and an anticharmed meson do correspond to the loosely bounded nonsmooth baryons.
Abstract: On 26 March 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of three new pentaquarks, namely ${P}_{c}(4312)$, ${P}_{c}(4440)$, and ${P}_{c}(4457)$, which are consistent with the loosely bound molecular hidden-charm pentaquark states composed of an $S$-wave charmed baryon ${\mathrm{\ensuremath{\Sigma}}}_{c}$ and an $S$-wave anticharmed meson ($\overline{D}$, ${\overline{D}}^{*}$). In this work, we present a direct calculation by the one-boson-exchange model and demonstrate explicitly that the ${P}_{c}(4312)$, ${P}_{c}(4440)$, and ${P}_{c}(4457)$ do correspond to the loosely bound ${\mathrm{\ensuremath{\Sigma}}}_{c}\overline{D}$ with ($I=1/2$, ${J}^{P}=1/{2}^{\ensuremath{-}}$), ${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{*}$ with ($I=1/2$, ${J}^{P}=1/{2}^{\ensuremath{-}}$), and ${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{*}$ with ($I=1/2$, ${J}^{P}=3/{2}^{\ensuremath{-}}$), respectively.

176 citations

Journal ArticleDOI
TL;DR: In this paper, the phase shifts for all the discussed channels were derived by adopting a one-boson-exchange model and considering the coupled channel effect, and the results excluded the newly ${Z}-cs}(3985{)}^{\ensuremath{-}}$ resonance with the BESIII Collaboration.
Abstract: Inspired by the newly ${Z}_{cs}(3985{)}^{\ensuremath{-}}$ reported by the BESIII Collaboration in the ${K}^{+}$ recoil-mass spectrum of the of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}({D}^{*0}{D}_{s}^{\ensuremath{-}}/{D}^{0}{D}_{s}^{*\ensuremath{-}}){K}^{+}$ processes, we perform a dynamical study on the ${D}^{(*)0}{D}_{s}^{*\ensuremath{-}}$ interactions by adopting a one-boson-exchange model and considering the coupled channel effect. After producing the phase shifts for all the discussed channels, our results exclude the newly ${Z}_{cs}(3985{)}^{\ensuremath{-}}$ as a ${D}^{*0}{D}_{s}^{\ensuremath{-}}/{D}^{0}{D}_{s}^{*\ensuremath{-}}/{D}^{*0}{D}_{s}^{*\ensuremath{-}}$ resonance with $I({J}^{P})=1/2({1}^{+},{0}^{\ensuremath{-}},{1}^{\ensuremath{-}},{2}^{\ensuremath{-}})$.

44 citations

Journal ArticleDOI
Rui Chen1
TL;DR: In this paper, a channel analysis of the LHCb-4459 system was performed using a one-boson-exchange model, and the results indicated that the newly reported LHCB 4459 system cannot be a pure pure σ-molecular state, but a coupled σ−molescular state.
Abstract: Stimulated by the ${P}_{cs}(4459)$ reported by the LHCb collaboration, we perform a single ${\mathrm{\ensuremath{\Xi}}}_{c}{\overline{D}}^{*}$ channel and a coupled ${\mathrm{\ensuremath{\Xi}}}_{c}{\overline{D}}^{*}/{\mathrm{\ensuremath{\Xi}}}_{c}^{*}\overline{D}/{\mathrm{\ensuremath{\Xi}}}_{c}^{\ensuremath{'}}{\overline{D}}^{*}/{\mathrm{\ensuremath{\Xi}}}_{c}^{*}{\overline{D}}^{*}$ channel analysis by using a one-boson-exchange model. Our results indicate that the newly ${P}_{cs}(4459)$ cannot be a pure ${\mathrm{\ensuremath{\Xi}}}_{c}{\overline{D}}^{*}$ molecular state, but a coupled ${\mathrm{\ensuremath{\Xi}}}_{c}{\overline{D}}^{*}/{\mathrm{\ensuremath{\Xi}}}_{c}^{*}\overline{D}/{\mathrm{\ensuremath{\Xi}}}_{c}^{\ensuremath{'}}{\overline{D}}^{*}/{\mathrm{\ensuremath{\Xi}}}_{c}^{*}{\overline{D}}^{*}$ bound state with $I({J}^{P})=0(3/{2}^{\ensuremath{-}})$, where the ${\mathrm{\ensuremath{\Xi}}}_{c}{\overline{D}}^{*}$ and ${\mathrm{\ensuremath{\Xi}}}_{c}^{*}\overline{D}$ components are dominant. Meanwhile, we find the interactions from the ${\mathrm{\ensuremath{\Xi}}}_{c}^{\ensuremath{'}}{\overline{D}}^{*}$ system with $0(1/{2}^{\ensuremath{-}})$, the ${\mathrm{\ensuremath{\Xi}}}_{c}^{*}\overline{D}$ system with $1(3/{2}^{\ensuremath{-}})$, and the ${\mathrm{\ensuremath{\Xi}}}_{c}^{*}{\overline{D}}^{*}$ system with $1(1/{2}^{\ensuremath{-}})$ are strongly attractive, where one can expect possible strange hidden-charm molecular or resonant structures near these thresholds with the assigned quantum numbers.

39 citations

Journal ArticleDOI
TL;DR: In this paper, the hidden-charm decay modes of the quark-quark interactions were studied in the presence of a quark interchange model, where all parameters are determined by the mass spectra of mesons.
Abstract: The ${P}_{c}(4312)$, ${P}_{c}(4440)$, and ${P}_{c}(4457)$ observed by the LHCb collaboration are very likely to be $S$-wave ${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{(*)}$ molecular candidates due to their near threshold character. In this work, we study the hidden-charm decay modes of these ${P}_{c}$ states, ${P}_{c}\ensuremath{\rightarrow}J/\ensuremath{\psi}p({\ensuremath{\eta}}_{c}p)$, using a quark interchange model. The decay mechanism for the ${P}_{c}\ensuremath{\rightarrow}J/\ensuremath{\psi}p({\ensuremath{\eta}}_{c}p)$ processes arises from the quark-quark interactions, where all parameters are determined by the mass spectra of mesons. We present our results in two scenarios. In scenario I, we perform the dynamical calculations and treat the ${P}_{c}$ states as pure ${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{(*)}$ molecules. In scenario II, after considering the coupled channel effect between different flavor configurations ${\mathrm{\ensuremath{\Sigma}}}_{c}^{(*)}{\overline{D}}^{(*)}$, we calculate these partial decay widths again. The decay patterns in these two scenarios can help us to explore the molecular assignment and the inner flavor configurations for the ${P}_{c}$ states. In particular, the decay widths of $\mathrm{\ensuremath{\Gamma}}({P}_{c}(4312)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}p)$ are comparable to the $J/\ensuremath{\psi}p$ decay widths in both of these two scenarios. Future experiments like LHCb may confirm the existence of the ${P}_{c}(4312)$ in the ${\ensuremath{\eta}}_{c}p$ channel.

34 citations

Journal ArticleDOI
TL;DR: In this article, the hidden-charm molecular pentaquark with double strangeness (HCHM) was investigated and two types of HCHM were shown to exist.
Abstract: Inspired by the recent evidence of ${P}_{cs}(4459)$ reported by LHCb, we continue to perform the investigation of hidden-charm molecular pentaquarks with double strangeness, which are composed of an $S$-wave charmed baryon ${\mathrm{\ensuremath{\Xi}}}_{c}^{(\ensuremath{'},*)}$ and an $S$-wave anticharmed-strange meson ${\overline{D}}_{s}^{(*)}$. Both the $S\text{\ensuremath{-}}D$ wave mixing effect and the coupled channel effect are taken into account in realistic calculation. A dynamics calculation shows that there may exist two types of hidden-charm molecular pentaquark with double strangeness, i.e., the ${\mathrm{\ensuremath{\Xi}}}_{c}^{*}{\overline{D}}_{s}^{*}$ molecular state with ${J}^{P}=5/{2}^{\ensuremath{-}}$ and the ${\mathrm{\ensuremath{\Xi}}}_{c}^{\ensuremath{'}}{\overline{D}}_{s}^{*}$ molecular state with ${J}^{P}=3/{2}^{\ensuremath{-}}$. According to this result, we strongly suggest the experimental exploration of hidden-charm molecular pentaquarks with double strangeness. Facing such opportunity, obviously the LHCb will have great potential to hunt for them, with the data accumulation at Run III and after High-Luminosity-LHC upgrade.

24 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the experimental and theoretical efforts on the hidden heavy flavor multiquark systems in the past three years were reviewed extensively in [Phys. Rept. 639 (2016) 1-121].
Abstract: The past seventeen years have witnessed tremendous progress on the experimental and theoretical explorations of the multiquark states. The hidden-charm and hidden-bottom multiquark systems were reviewed extensively in [Phys. Rept. 639 (2016) 1-121]. In this article, we shall update the experimental and theoretical efforts on the hidden heavy flavor multiquark systems in the past three years. Especially the LHCb collaboration not only confirmed the existence of the hidden-charm pentaquarks but also provided strong evidence of the molecular picture. Besides the well-known $XYZ$ and $P_c$ states, we shall discuss more interesting tetraquark and pentaquark systems either with one, two, three or even four heavy quarks. Some very intriguing states include the fully heavy exotic tetraquark states $QQ\bar Q\bar Q$ and doubly heavy tetraquark states $QQ\bar q \bar q$, where $Q$ is a heavy quark. The $QQ\bar Q\bar Q$ states may be produced at LHC while the $QQ\bar q \bar q$ system may be searched for at BelleII and LHCb. Moreover, we shall pay special attention to various theoretical schemes. We shall emphasize the model-independent predictions of various models which are truly/closely related to Quantum Chromodynamics (QCD). There have also accumulated many lattice QCD simulations through multiple channel scattering on the lattice in recent years, which provide deep insights into the underlying structure/dynamics of the $XYZ$ states. In terms of the recent $P_c$ states, the lattice simulations of the charmed baryon and anti-charmed meson scattering are badly needed. We shall also discuss some important states which may be searched for at BESIII, BelleII and LHCb in the coming years.

339 citations

Journal ArticleDOI
Jun He1
TL;DR: In this paper, the LHCb Collaboration reported their new results about the pentaquarks at the charm energy region, and the two-peak structure around 4450 MeV can be interpreted as two $$\varSigma _c \bar{D}^*$$¯¯¯¯ bound states with spin parity.
Abstract: Very recently, the LHCb Collaboration reported their new results about the pentaquarks at charm energy region. Based on the new experimental results, we recalculate the molecular states composed of a $$\varSigma _c^{(*)}$$ baryon and a $$\bar{D}^{(*)}$$ meson in a quasipotential Bethe–Salpeter equation approach. The two-peak structure around 4450 MeV can be interpreted as two $$\varSigma _c \bar{D}^*$$ bound states with spin parities $$1/2^-$$ and $$3/2^-$$ . The newly observed pentaquark $$P_c(4312)$$ can be assigned as a $$\varSigma _c\bar{D}$$ bound state with spin parity $$1/2^-$$ . The experimental determination of spin parities will be very helpful to understand the internal structure of these pentaquarks.

147 citations

Journal ArticleDOI
TL;DR: In this paper, the authors study the LHCb pentaquark candidates P c (4312 ), P c( 4440 ) and P c 4457 ) in the framework of the effective-range expansion and resonance compositeness relations.

115 citations

Journal ArticleDOI
TL;DR: In this paper, the authors discuss possible interpretations of the hidden-charm pentaquark states, and propose to measure their spin-parity quantum numbers to verify these assignments.
Abstract: Based on our previous QCD sum rule studies on hidden-charm pentaquark states, we discuss possible interpretations of the ${P}_{c}(4312)$, ${P}_{c}(4440)$, and ${P}_{c}(4457)$, which were recently observed by LHCb. Our results suggest that the ${P}_{c}(4312)$ can be well interpreted as the $[{\mathrm{\ensuremath{\Sigma}}}_{c}^{++}{\overline{D}}^{\ensuremath{-}}]$ bound state with ${J}^{P}=1/{2}^{\ensuremath{-}}$, while the ${P}_{c}(4440)$ and ${P}_{c}(4457)$ can be interpreted as the $[{\mathrm{\ensuremath{\Sigma}}}_{c}^{+}{\overline{D}}^{0}]$ bound state with ${J}^{P}=1/{2}^{\ensuremath{-}}$, the $[{\mathrm{\ensuremath{\Sigma}}}_{c}^{*++}{\overline{D}}^{\ensuremath{-}}]$ and $[{\mathrm{\ensuremath{\Sigma}}}_{c}^{+}{\overline{D}}^{*0}]$ bound states with ${J}^{P}=3/{2}^{\ensuremath{-}}$, or the $[{\mathrm{\ensuremath{\Sigma}}}_{c}^{*+}{\overline{D}}^{*0}]$ bound state with ${J}^{P}=5/{2}^{\ensuremath{-}}$. We propose to measure their spin-parity quantum numbers to verify these assignments.

115 citations