New LHCb pentaquarks as hadrocharmonium states

Abstract

New LHCb Collaboration results on pentaquarks with hidden charm [1] are discussed. These results fit nicely in the hadrocharmonium pentaquark scenario [2,3]. In the new data the old LHCb pentaquark $P_c(4450)$ splits into two states $P_c(4440)$ and $P_c(4457)$. We interpret these two almost degenerate hadrocharmonium states with $J^P=1/2^{-}$ and $J^P=3/2^{-}$ as a result of hyperfine splitting between hadrocharmonium states predicted in [2]. It arises due to QCD multipole interaction between color-singlet hadrocharmonium constituents. We improve the theoretical estimate of hyperfine splitting [2,3] that is compatible with the experimental data. The new $P_c(4312)$ state finds a natural explanation as a bound state of ${\chi }_{c0}$ and a nucleon, with $I=1/2$, $J^P=1/2^{+}$ and binding energy 42 MeV. As a bound state of a spin-zero meson and a nucleon, hadrocharmonium pentaquark $P_c(4312)$ does not experience hyperfine splitting. We find a series of hadrocharmonium states in the vicinity of the wide $P_c(4380)$ pentaquark that can explain its apparently large decay width. We compare the hadrocharmonium and molecular pentaquark scenarios and discuss their relative advantages and drawbacks.

10 pages

References in corpus (18)

• Pentaquark and Tetraquark states
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Charmonium
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Hadro-Charmonium
• Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysis
• Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks
• Study of $P_c(4457)$, $P_c(4440)$, and $P_c(4312)$ in a quasipotential Bethe-Salpeter equation approach
• Isospin breaking decays as a diagnosis of the hadronic molecular structure of the $P_c(4457)$
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• Mass spectrum of the hidden-charm pentaquarks in the compact diquark model
• Narrow exotic tetraquark mesons in large-$N_c$ QCD
• Tetraquark and two-meson states at large $N_{\mathrm{c}}$
• Decays of Pentaquarks in Hadrocharmonium and Molecular Pictures

Cited by in corpus (40)

• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Tetra- and penta-quark structures in the constituent quark model
• Revisiting the nature of the $P_c$ pentaquarks
• The $P_{cs}(4459)$ pentaquark from a combined effective field theory and phenomenological perspective
• Can discovery of hidden charm strange pentaquark states help determine the spins of $P_c(4440)$ and $P_c(4457)$?
• Analysis of the $P_{cs}(4459)$ as the hidden-charm pentaquark state with QCD sum rules
• Probing hidden-charm decay properties of $P_c$ states in a molecular scenario
• Coupled-channel effects of the ${\Sigma }_c^{(\ast )}{\bar{D}}^{(\ast )}$-${\Lambda }_c(2595)\bar{D}$ system and molecular nature of the $P_c$ pentaquark states from one-boson exchange model
• Magnetic dipole moments of the hidden-charm pentaquark states: $P_c(4440)$, $P_c(4457)$ and $P_{cs}(4459)$
• Magnetic moments and transition magnetic moments of $P_c$ and $P_{cs}$ states
• $P_c(4312{)}^{+}$, $P_c(4380{)}^{+}$, and $P_c(4457{)}^{+}$ as double triangle cusps
• How to reveal the nature of three or more pentaquark states?
• ${\rm Y}$ photo-production on the proton at the Electron-Ion Collider
• Heavy-hadron molecules from light-meson-exchange saturation
• Model independent determination of the spins of the $P_c$(4440) and $P_c$(4457) from the spectroscopy of the triply charmed dibaryons
• $QQ\bar{s}\bar{s}$ tetraquarks in the chiral quark model
• Interpretations of the new LHCb $P_c(4337{)}^{+}$ pentaquark state
• Analysis of the hidden-charm pentaquark states based on magnetic moment and transition magnetic moment
• Compact hidden charm pentaquark states and QCD isomers
• Hidden-charm pentaquark states through the current algebra: From their productions to decays
• Peaks within peaks and the possible two-peak structure of the Pc(4457): the effective field theory perspective
• Properties of $P_c(4312)$ pentaquark and its bottom partner
• The hadronic coupling constants of the lowest hidden-charm pentaquark state with the QCD sum rules in rigorous quark-hadron duality
• Triply charmed dibaryons in the one boson exchange model
• Production of hidden-charm strange pentaquarks $P_{cs}$ from the $K^{-}p\to J/\psi \Lambda$ reaction
• Three-body molecules $\bar{D}{\bar{D}}^{\ast }{\Sigma }_c$- understanding the nature of $T_{cc}$, $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$
• Prompt production of the hidden charm pentaquarks in the LHC
• Search for hidden-charm pentaquark states in three-body final states
• Holographic charm and bottom pentaquarks I: Mass spectra with spin effects
• Holographic charm and bottom pentaquarks III: Excitations through photo-production of heavy mesons
• Unravelling Pentaquarks with Born--Oppenheimer effective theory
• Molecular pentaquark states with open charm and bottom flavors
• The Production of Singly Charmed Pentaquark $\bar{c}qqqq$ from Bottom Baryon
• Molecular $P_{\psi }$ pentaquarks from light-meson exchange saturation
• Study of the hidden charm pentaquarks ${\Lambda }_{c\bar{c}}$ above $4$ GeV
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• Hidden bottom pentaquark in the SU(5) version of the flavor-spin model
• Molecular interpretation of the LHCb pentaquarks from an analysis of $J/\psi p$ spectrum
• Hadronic molecules and multiquark states
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders