Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$

Abstract

A narrow pentaquark state, $P_c(4312{)}^{+}$, decaying to $J/\psi p$ is discovered with a statistical significance of $7.3\sigma$ in a data sample of ${\Lambda }_b^0\to J/\psi p{K}^{-}$ decays which is an order of magnitude larger than that previously analyzed by the LHCb collaboration. The $P_c(4450{)}^{+}$ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, $P_c(4440{)}^{+}$ and $P_c(4457{)}^{+}$, where the statistical significance of this two-peak interpretation is $5.4\sigma$. Proximity of the ${\Sigma }_c^{+}{\bar{D}}^0$ and ${\Sigma }_c^{+}{\bar{D}}^{\ast 0}$ thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-014.html

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• Spectroscopic Properties of Double-Strangeness Molecular Tetraquarks
• Interaction and Identification of the Meson-Baryon molecules
• Analytic Map of Three-Channel S Matrix -Generalized Uniformization and Mittag-Leffler Expansion-
• Molecular $P_{\psi }$ pentaquarks from light-meson exchange saturation
• Molecular states in $D_s^{(\ast )+}{\Xi }_c^{{(}^{\prime },\ast )}$ systems
• Production of pentaquarks with hidden charm and double strangeness in ${\Xi }_b$ and ${\Omega }_b$ decays
• Observation of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ in the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay
• Magnetic Moments of Hidden-Charm Pentaquarks in the Diquark-Diquark-Antiquark Scheme
• Production mechanism of hidden-charm pentaquark states $P_{c\bar{c}s}$ with strangeness $S=-1$
• Production of vector mesons in pentaquark states resonance channel in $p$-$A$ ultraperipheral collisions
• The possibility to study in-medium modification of $J/\psi$ mesons from their photoproduction on nuclei near threshold in the case of presence of the LHCb pentaquark states $P_c^{+}$ in this photoproduction
• Data-based analysis of Forward-Backward Asymmetry in $B^{\pm }\to K^{\pm }{K}^{\mp }{K}^{\pm }$
• Prediction of five-flavored pentaquarks
• Doubly charmed dibaryon states
• Insights into the nature of the $P_{cs}(4459)$
• QCD sum rule study for hidden-strange pentaquarks
• Role of the short-range dynamics in the formation of $D^{(\ast )}{\bar{D}}^{(\ast )}/B^{(\ast )}{\bar{B}}^{(\ast )}$ hadronic molecules
• Feasibility study of the $K^{+}d\to K^{0}pp$ reaction for the "${\Theta }^{+}$" pentaquark
• QFT treatment of a bound state in a thermal gas
• Interpretation of near-threshold peaks using the method of independent S-matrix poles
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• $P_c(4457)$ interpreted as a $J^P=1/2^{+}$ state by ${\bar{D}}^0{\Lambda }_c^{+}(2595)$-${\pi }^0{P}_c(4312)$ interaction
• Phenomenological Analysis of Triply Heavy Pentaquarks with configurations $q\Bar{q}QQQ$ and $qqQQ\Bar{Q}$
• The ${\Omega }_{cc}$ resonances with negative parity in the chiral constituent quark model
• Possible $P$- wave $D_s{\bar{D}}_{s0}(2317)$ molecular state $Y^{{}^{\prime }}(4274)$
• Measurement of f${}_1$(1285) production in pp collisions at $\sqrt{\text{s}}$ = 13 TeV
• Towards modeling the short-range interactions of hidden/open charm pentaquark molecular states
• Prospects for detecting the hidden-strange pentaquarklike state $N^{\ast }(2080)$ in the ${\pi }^{-}p\to \varphi n$ reaction
• The Pentaquark Spectrum from Fermi Statistics
• Analytical dispersive parameterization for elastic scattering of spinless particles
• First observation of ${\Lambda }_b^0\to {\Sigma }_c^{(\ast )++}{D}^{(\ast )-}{K}^{-}$ decays
• The $\varphi NN,J/\psi NN,{\eta }_{c}NN$ systems based on HAL QCD interactions
• Masses and Magnetic Moments of Singly Heavy Pentaquarks
• Exclusive Charmonium Production at the Electron-ion collider in China
• First observation of the decay ${\Lambda }_b^0\to {\eta }_c(1S)p{K}^{-}$
• Investigate the pentaquark resonance in the $NK$ system
• Determination of parameters of a potential model for tetraquark study by studying all S-wave mesons
• DeepQuark: A Deep-Neural-Network Approach to Multiquark Bound States
• Studies on the $K^{\ast }\Sigma$ bound-state via $K^{+}p\to K^{+}\varphi p$
• Study of the resonance contributions in the ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decay
• Thermal production of sexaquarks in heavy-ion collisions
• Production of the (predicted) $K^{\ast }(4307)$ in $B$ decays
• Possible molecules of triple-heavy pentaquarks within the extended local hidden gauge formalism
• Electromagnetic properties of possible triple-charm molecular hexaquarks
• Heavy baryon production with an instanton interaction
• Regge Trajectories of Tetraquarks and Pentaquarks with Massive Quarks in the Flux Tube Model
• Coupled-channel ${\Lambda }_c{K}^{+}-p{D}_s$ Interaction in Flavor $\text{SU}\left(3\right)$ Limit of Lattice QCD
• Observation of ${\Lambda }_b^0\to {\Lambda }_c^{+}{\bar{D}}^{(\ast )0}{K}^{-}$ and ${\Lambda }_b^0\to {\Lambda }_c^{+}{D}_s^{\ast -}$ decays
• Observation of $D^{+}\to f_0(500){\mu }^{+}{\nu }_{\mu }$ and study of $D^{+}\to {\pi }^{+}{\pi }^{-}{\ell }^{+}{\nu }_{\ell }$ decay dynamics
• Production potential of hidden-strange molecular pentaquarks through the ${\pi }^{-}p\to K^{\ast }\Sigma$ process
• A Simple Model of Pentaquarks
• Double strangeness pentaquarks and other exotic hadrons in the ${\Xi }_b\to \Xi J/\Psi \varphi$ decay
• Study of the hidden charm pentaquarks ${\Lambda }_{c\bar{c}}$ above $4$ GeV
• Deciphering the mechanism of $J/\psi$-nucleon scattering
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• Research on the Phase space of three- and four-body final states process
• Subthreshold production of $J/\psi$ mesons from the deuteron with SoLID
• Discovering an Unquenched Dynamics Mechanism for Charmonium Scattering
• Finding Interaction Mechanism between Exotic Molecule and Conventional Hadron
• Decay behavior of hidden-strange hadronic molecular state $N(2270)$
• Hadrons and Few-Body Physics
• Observation of the ${\Lambda }_b^0\to J/\psi {\Xi }^{-}{K}^{+}$ and ${\Xi }_b^0\to J/\psi {\Xi }^{-}{\pi }^{+}$ decays
• Analysis of bound and resonant states of doubly heavy tetraquarks with spin $J\le 2$
• Exotic Hadrons in the ${\Lambda }_b\to J/\psi \varphi \Lambda$ Decay
• Triple-strangeness hidden-charm pentaquarks
• The odd-parity strange baryons $\Sigma ({\frac{1}{2}}^{-})$ below 1.8 GeV with Hamiltonian effective field theory
• Electromagnetic characteristics as probes into the inner structures of the predicted ${\Xi }_c^{{(}^{\prime },\ast )}{D}_s^{(\ast )}$ molecular states
• Searches for Exotic Hadrons at GlueX
• Radiative decay and axial-vector decay behaviors of octet pentaquark states
• Observation of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{K}^{+}{K}^{-}{\pi }^{-}$ decay
• First observation of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{D}_s^{-}{K}^{+}{K}^{-}$ decay and search for pentaquarks in the ${\Lambda }_c^{+}{D}_s^{-}$ system
• Experimental summary: QCD session of the 54th Rencontres de Moriond (Moriond QCD 2019)
• First evidence of $CP$ violation in beauty baryon to charmonium decays
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• Production of $X_{cs\bar{c}\bar{s}}$ in heavy ion collisions
• Nature of $X(2370)$
• Exotic Heavy Hadrons
• Towards a theory of baryon resonances
• Strong decays of the $P_c(4312)$ and its isospin cousin via the QCD sum rules
• Strong decays of the $P_{cs}(4338)$ and its high isospin cousin via the QCD sum rules
• $D$-wave excited $cs\bar{c}\bar{s}$ tetraquark states with $J^{PC}=1^{++}$ and $1^{+-}$
• Search for the $N$(1685) in $\eta \pi$-Photoproduction
• Hidden charm ${\mathcal{P}}_{cs}(4338{)}^0$ production in baryonic $B^{-}\to J/\psi \Lambda \bar{p}$ decay
• Search for an exotic S=-2, Q=-2 baryon resonance in proton-proton interactions at $\sqrt{s_{NN}}$ = 17.3 GeV
• Possible ${\Sigma }_c^{\ast }\bar{\Sigma }$ molecular states
• Predicting the Masses of Exotic Hadrons with Data Augmentation Using Multilayer Perceptron
• Doubly-charmed pentaquark states in a mass splitting model
• $N^{\ast }$ states with hidden charm and a three-body nature
• Quark-model search for compact $c\bar{c}uds$ pentaquark states
• Quantum Numbers of the Pentaquark States $P_c^{+}$ via Symmetry Analysis
• Lattice spectroscopy with focus on exotics
• Learning Pole Structures of Hadronic States using Predictive Uncertainty Estimation
• Spectrum of Hidden-Charm, Open-Strange Exotics in the Dynamical Diquark Model
• Hadronic molecules and multiquark states
• Study of Fully heavy Pentaquarks using extended Gursey-Radicati formalism
• Production of hidden-heavy and double-heavy hadronic molecules at the $Z$ factory of CEPC
• Five-flavor molecular pentaquarks in the ${\Xi }_b^{(\prime ,\ast )}{\bar{D}}^{(\ast )}$ and ${\Xi }_c^{(\prime ,\ast )}{B}^{(\ast )}$ systems
• Possible ${\bar{D}}^{(\ast )}{\Xi }_{cc}^{(\ast )}$ and ${\Xi }_{cc}^{(\ast )}{\Xi }_{cc}^{(\ast )}$ molecules as superflavor partners of $T_{cc}$
• Systematic exploration of triply heavy tetraquarks: spectroscopic and decay characteristics
• Strange pentaquark molecules in QCD sum rules
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders
• Wigner rotations for cascade reactions
• Interactions between two heavy mesons within heavy meson chiral effective field theory
• Searching for a $P_{cs}(4200)$ state in the ${\Lambda }_b\to \varphi {\eta }_c\Lambda$ reaction
• Molecular pentaquarks composed of a ground-state octet baryon and a $P-$wave anticharmed meson
• Complete basis for the pentaquark wave function in a group theory approach
• Exotic hadrons associated with $b$-quark
• Summary of Working Group 5: Physics with Heavy Flavours
• Proposal to detect a moving triangle singularity in $\psi (2S)\to {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$ process
• Qualitative analysis of proton inelastic scattering for diquark searching
• Prospects for compact hexaquarks under the limitation imposed by quark confinement
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II
• Predicting charmed-strange molecular tetraquarks with $K^{(\ast )}$ and $T$-doublet charmed or anticharmed meson
• Compositness and wave function of shallow bound states in relation to scattering observables
• Role of the short-range dynamics in simultaneous interpretation of $P_{cs}$ pentaqurks via ${\Xi }_c^{(\prime ,\ast )}{\bar{D}}^{(\ast )}$ molecules
• Analytic electromagnetic signatures of compact pentaquark structure: A multi-current QCD light-cone sum rules analysis of the $P_{\psi s}^{\Lambda }$ states