Can the newly reported P c s (4459 ) be a strange hidden-charm Ξ c D ¯* molecular pentaquark?
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.
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TL;DR: In this article , an updated review of the recent experimental and theoretical progresses in the active field of hadron physics has been provided, including the recently observed open heavy flavor tetraquark states X(2900) and Tcc+(3875) as well as the hidden heavy flavor multiquark states.
Abstract: The past decades witnessed the golden era of hadron physics. Many excited open heavy flavor mesons and baryons have been observed since 2017. We shall provide an updated review of the recent experimental and theoretical progresses in this active field. Besides the conventional heavy hadrons, we shall also review the recently observed open heavy flavor tetraquark states X(2900) and Tcc+(3875) as well as the hidden heavy flavor multiquark states X(6900), Pcs(4459)0 , Zcs(3985)− , Zcs(4000)+ , and Zcs(4220)+ . We will also cover the recent progresses on the glueballs and light hybrid mesons, which are the direct manifestations of the non-Abelian SU(3) gauge interaction of the Quantum Chromodynamics in the low-energy region.
109 citations
01 Jan 2012
TL;DR: In this paper, the authors studied the possible existence of very loosely bound hidden-charm molecular baryons composed of an anti-charmed meson and a charmed baryon.
Abstract: Using the one-boson-exchange model,we studied the possible existence of very loosely bound hidden-charm molecular baryons composed of an anti-charmed meson and a charmed baryon.Our numerical results indicate that the Σ c * and Σ c states exist,but that the Λ c and Λ c * molecular states do not.
64 citations
TL;DR: In this article, a coupled-channel study of the Ξc*D¯*, ξc′D¯, Ξ c *D¯, ΞC*D´¯, ǫ-D´ǫD'ǫ, and Ã-D¯ interactions in the quasipotential Bethe-Salpeter equation approach was performed with the help of light meson exchanges.
Abstract: Recently, the LHCb Collaboration reported a new structure Pcs(4459) with a mass of 19 MeV below the ΞcD¯* threshold It may be a candidate of molecular state from the ΞcD¯* interaction In the current work, we perform a coupled-channel study of the Ξc*D¯*, Ξc′D¯*, Ξc*D¯, ΞcD¯*, Ξc′D¯, and ΞcD¯ interactions in the quasipotential Bethe-Salpeter equation approach With the help of the heavy quark chiral effective Lagrangian, the potential is constructed by light meson exchanges Two ΞcD¯* molecular states are produced with spin parities JP=1/2- and 3/2- The lower state with 3/2- can be related to the observed Pcs(4450) while two-peak structure cannot be excluded Within the same model, other strange hidden-charm pentaquarks are also predicted Two states with spin parities 1/2- and a state with 3/2- are predicted near the Ξc′D¯, ΞcD¯, and Ξc*D¯ thresholds, respectively As two states near ΞcD¯* threshold, two states are produced with 1/2- and 3/2- near the Ξc′D¯* threshold The couplings of the molecular states to the considered channels are also discussed The experimental research of those states are helpful to understand the origin and internal structure of the Pcs and Pc states
36 citations
TL;DR: In this paper , an extensive review of the progress on the heavy hadronic molecular states within the framework of the chiral perturbation theory is presented, in which the same chiral dynamics not only govern the nuclei and forms the deuteron, but also dictates the shallow bound states or resonances composed of two heavy hadrons.
26 citations
TL;DR: In this paper, the authors employed the light-cone QCD sum rule to calculate the magnetic dipole moments of the pentaquark states by considering them as the diquark-diquark antiquark and molecular pictures with quantum numbers.
Abstract: In this work, we employ the light-cone QCD sum rule to calculate the magnetic dipole moments of the $$P_c(4440)$$
, $$P_c(4457)$$
and $$P_{cs}(4459)$$
pentaquark states by considering them as the diquark–diquark–antiquark and molecular pictures with quantum numbers $$J^P = \frac{3}{2}^-$$
, $$J^P = \frac{1}{2}^-$$
and $$J^P = \frac{1}{2}^-$$
, respectively. In the analyses, we use the diquark–diquark–antiquark and molecular form of interpolating currents, and photon distribution amplitudes to obtain the magnetic dipole moment of pentaquark states. Theoretical examinations on magnetic dipole moments of the hidden-charm pentaquark states, are essential as their results can help us better figure out their substructure and the dynamics of the QCD as the theory of the strong interaction. As a by product, we extract the electric quadrupole and magnetic octupole moments of the $$P_c(4440)$$
pentaquark. These values show a non-spherical charge distribution.
23 citations
References
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01 Aug 2020
3,138 citations
TL;DR: Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model as discussed by the authors, and investigated various theoretical interpretations of these candidates of the multiquark states.
1,083 citations
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TL;DR: In this article, the authors review experimental evidences of various candidates of hadronic molecules, and methods of identifying such structures Nonrelativistic effective field theories are the suitable framework for studying hadronic molecule, and are discussed in both the continuum and finite volumes.
Abstract: A large number of experimental discoveries especially in the heavy quarkonium sector that did not at all fit to the expectations of the until then very successful quark model led to a renaissance of hadron spectroscopy Among various explanations of the internal structure of these excitations, hadronic molecules, being analogues of light nuclei, play a unique role since for those predictions can be made with controlled uncertainty We review experimental evidences of various candidates of hadronic molecules, and methods of identifying such structures Nonrelativistic effective field theories are the suitable framework for studying hadronic molecules, and are discussed in both the continuum and finite volumes Also pertinent lattice QCD results are presented Further, we discuss the production mechanisms and decays of hadronic molecules, and comment on the reliability of certain assertions often made in the literature
1,016 citations
TL;DR: In this article, the pentaquark-charmonium states were observed in the J/ψp channel in Λ0b→J/K−p decays and the significance of these resonances is more than 9 standard deviations.
Abstract: Observations of exotic structures in the J/ψp channel, that we refer to as pentaquark-charmonium states, in Λ0b→J/ψK−p decays are presented. The data sample corresponds to an integrated luminosity of 3/fb acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis is performed on the three-body final-state that reproduces the two-body mass and angular distributions. To obtain a satisfactory fit of the structures seen in the J/ψp mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. The significance of each of these resonances is more than 9 standard deviations. One has a mass of 4380±8±29 MeV and a width of 205±18±86 MeV, while the second is narrower, with a mass of 4449.8±1.7±2.5 MeV and a width of 39±5±19 MeV. The preferred JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
847 citations
TL;DR: In this article, the authors review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances.
Abstract: Multiquark resonances are undoubtedly experimentally observed The number of states and the amount of details on their properties has been growing over the years It is very recent the discovery of two pentaquarks and the confirmation of four tetraquarks, two of which had not been observed before We mainly review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances The prominent problems plaguing theoretical models, like the absence of selection rules limiting the number of states predicted, motivate new directions in model building Data are reviewed going through all of the observed resonances with particular attention to their common features and the purpose of providing a starting point to further research
548 citations